However, this is predicated on the idea that the atmospheric carbon 14 content has remained constant.The answer, which is possibly 3 x 5568, is 16,704 years.
How old is the bone on average?Three half life have elapsed when a reduction is made to one eighth of existing levels (1/2 3 = 1/8).
To accommodate for fluctuations in carbon 14 concentration levels, a modification should be made.
The correction can be calculated using the graph below.
The answer, which is possibly 3 x 5568, is 16,704 years.
However, the half life of carbon 14 is actually 5730 +/- 40 years, not 5,568.
3 * 5730 = 17,190 years.
However, this is predicated on the idea that the atmospheric carbon 14 content has remained constant.
Not at all.
A adjustment should be used to account for variations in carbon 14 concentration levels.The graph below can be used to determine the adjustment.
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Some 2-methyl-2-butene may beproduced in the reaction as a by-product. Give the mechanism forits production.
2-methyl-2-
butanol to form2-methyl-2-butene.
2-methyl-2-
butanol to form 2-methyl-2-butene.
Two substituents are taken out of the reactant molecule in an elimination reaction to create the product.
In a one- or two-step method, two substituents are eliminated from a molecule in an organic reaction known as an elimination reaction. Atoms are eliminated as molecules and compounds during an elimination reaction. Two substituents are taken out of the reactant molecule in an elimination reaction to create the product. A metal, an acid, or a base typically catalyze elimination. E1 and E2 reactions are the two primary categories of elimination processes in organic chemistry. Both E1 and E2 processes are also known as alcohol elimination reactions and alkyl halide elimination reactions, respectively. Any organic chemical reaction known as an elimination reaction in which two atoms and groups of atoms are eliminated.
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A balloon that contains 4.80 g of carbon dioxide gas has a volume of 12.0 L. Assume
that the pressure and temperature of the balloon remain constant. What is the new
volume of the balloon if an additional 0.50 mol of CO₂ is added? [ans: 67 L]
Answer:
the new volume of the balloon after 0.50 mol of CO2 is added is 67 L.
Explanation:
To solve this problem, we need to use the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature and number of moles, and inversely proportional to its volume. This relationship can be written as:
PV = nRT
Where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature of the gas.
In this problem, the pressure, temperature, and number of moles of the gas all remain constant, so we can rearrange the ideal gas law to solve for the volume of the gas:
V = nRT/P
Plugging in the given values, we find that the volume of the gas is:
V = (0.50 mol CO2)(0.08206 Latm/molK)(298 K)/(1 atm)
V = 67 L
. How many grams of CaCl₂ (molar mass = 111
g/mol) are needed to prepare 100. mL of 0.100
M solution? Show your calculation to receive
full credit.
A) 55.5 g
B) 111 g
C) 222 g
D) 555 g
Answer:
1.11 grams CaCl₂
**I am aware that this is not one of the answer choices, but I pretty confident that this should be the correct answer according the the given values
Explanation:
To find the mass of CaCl₂ necessary, you need to
(1) convert the volume from mL to L (1,000 mL = 1 L)
(2) calculate the amount of moles (M = moles / L)
(3) convert moles to grams (using the molar mass)
It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given values.
(Step 1)
100. mL CaCl₂ 1 L
-------------------------- x ------------------- = 0.100 L CaCl₂
1,000 mL
(Step 2)
Molarity (M) = moles / volume (L) <----- Molarity ratio
0.100 M = moles / 0.100 L <----- Insert values
0.0100 = moles <----- Multiply both sides by 0.100 L
(Step 3)
Molar Mass (CaCl₂): 111 g/mol
0.0100 moles CaCl₂ 111 grams
--------------------------------- x --------------------- = 1.11 grams CaCl₂
1 mole
Which of the following standard enthalpy of formation values are not zero at 25 oC? Select all that apply. a. Ne(g)b. Hg(l)c. Na(s)d. H(g)e. Ag(s)f. S8(s)(rhombic)
H, S8(monoclinic), as well as Methane are the appropriate responses (g). For these three chemicals, overall enthalpy of production is not zero.
Entropy vs. enthalpy: what are they?Entropy is the quantity of inherent disorder within a substance, whereas enthalpy is the quantity of internal energy. Enthalpy is greater than 0 for water since it is equal for elemental compounds like hydrogen gas and gaseous oxygen (regardless of phase).
What distinguishes enthalpy from energy?Enthalpy with internal energy vary primarily in that internal energy is the total of a system's both potential and kinetic energy, whilst enthalpy is indeed the heat absorbed is evolved through chemical processes that take place in a system.
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in the following reaction 2Al + FeO2 ---> Al2O2 +2Fe. If 8 grams of Fe2O3 reacted with an excess of Al the maximum number of moles of Fe could be produced is ? A. 0.100 b. 0.200 c. 0.300 4. 0.400
The maximum number of moles of Fe could be produced is 0.1 option - A is correct.
How are grams and moles converted?The grams to moles formula must be used in order to accurately calculate the number of moles, n, of a substance with a given mass, m, (in grams): M is the material's molar mass, so n = m / M.
According to the periodic table, the molecular mass of iron, to three decimal places, is 55.845 and its elemental symbol is Fe.
Moles = mass/molar mass
Molar mass of Fe = 56
Number of moles of Fe = 8/56
Number of moles of Fe = 0.14moles.
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You are in charge of making Kool-Aid for a fundraiser. You need to mix the
powder into the water as fast as you can. How could you use your knowledge of
reaction rates to increase the speed at which you can mix the Kool-Aid? (Please
write 2-5 sentences.)
Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) show that the Pleistocene ______.
Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) indicate that the Pleistocene was characterized by frequent and widespread climate variability.
This included cycles of glacial advance and retreat.
These changes were caused by variations in the Earth's orbit and tilt, affecting the amount of solar radiation received by different parts of the Earth.
The Pleistocene also saw a series of major ice ages, during which ice sheets and glaciers covered most of the Earth's surface. These ice ages were interspersed with shorter, warmer periods called interglacials. During that time, the Earth's climate resembled the present climate.
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Which of the following is a heterogeneous mixture?
Opotting soil
Tap Water
Ochlorine gas (CI)
Otable salt NaCl
From the available choices, Heterogeneous combinations make up potting soil.
In heterogeneous blends, we can easily discern between the various components. The soil's components make up a heterogeneous mixture since they don't all have the same physical and chemical properties.
It's a great idea to grow indoor and potted plants in potting soil. It is typically more nutritious and well-balanced for the plants. The phrase "soil heterogeneity" refers to the diversity of soil traits or taxonomic groupings found in a certain area. Potting soil is a heterogeneous mixture since its composition is not homogeneous.
Tap water is uniform and impossible to identify salt particles without the proper equipment since salt virtually completely dissolves into it.
Chlorine gas (Cl) is a component of homogeneous compounds. Potassium and chlorine are a mixture because all of the components are heterogeneous, or separate.
Table salt is a homogeneous mixture. It contains several ingredients, hence it is not a compound.
The only heterogeneous substance would be potting soil since, without the use of specialist equipment, we can see a variety of particles with different sizes, forms, colors, and other properties.
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Calculate the radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and that each beta particle has an energy of 1.0×10−13 J.
The radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation is 8.54 x 10⁻⁴ J/kg.
What is radiation?Radiation is defined as the energy that can be depicted as waves or particles and travels from one location to another. The DNA in our cells can be harmed by radiation.
The radiation dosage is determined by the ratio of the total dose to the exposed person's mass.
3 Ci beta radiation = 3 x (3.7x10¹⁰) = 11.1 x 10¹⁰decay/s.
Total beta energy taken in over 5 seconds
Et = ( 11.1 x 10¹⁰ ) x 5 x 1.0 x 10⁻¹³
Et = 55.5 x 10⁻³
The person's radiation dose is estimated as follows;
Rd = ET / m
Rd = 55.5 x 10⁻³ / 65 kg
Rd = 8.54 x 10⁻⁴ J/kg.
Thus, the radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation is 8.54 x 10⁻⁴ J/kg.
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The question I need help with is in the photo
Answer: 144.2
Explanation:
Note that [tex]23.0^{\circ}\text{C}=298.0\text{ K}[/tex].
Using the formula [tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex] yields:
[tex]\frac{2.45}{T_1}=\frac{1.75}{298}\\\\T_1=\frac{298 \times 2.45}{1.75} \text{ K}\\\\T_1=\frac{298 \times 2.45}{1.75}-273^{\circ}\text{C}\\\\T_1=144.2^{\circ}\text{C}[/tex]
g the main cause of the increase in the amount of co2 in earth's atmosphere over the past 170 years is . increased infrared radiation absorption by the atmosphere increased worldwide fertilizer production increased worldwide primary production the burning of fossil fuels and deforestatio
the main cause of the increase in the amount of co2 in earth's atmosphere over the past 170 years is . increased infrared radiation absorption by the atmosphere increased worldwide fertilizer production increased
the burning of larger amounts of wood and fossil fuels
An extracted and burned fossil fuel[a] is a hydrocarbon-containing substance that naturally originated in the Earth's crust from the remains of extinct plants and animals. Coal, oil, and natural gas are the three primary fossil fuels. Fossil fuels can be used to produce energy, power engines (like internal combustion engines in cars), or supply heat for immediate use (such for cooking or heating). Before burning, some fossil fuels are processed to produce derivatives like kerosene, gasoline, and propane. The anaerobic decomposition of buried deceased animals that contained organic molecules produced by photosynthesis is the source of fossil fuels. [4] The geological process that transforms these elements into high-carbon fossil fuels often takes millions of years.
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naturally occuring minerals in rocks have a visible crystalline structure
Naturally occurring minerals in rocks have a visible crystalline structure because they have a definite chemical composition which allows for the atoms arranged within the mineral to be in a specific ordered manner.
What is a Crystalline solid?This is referred to as a solid material whose atoms are arranged in a highly ordered microscopic structure thereby forming a crystal lattice present on all the sides.
Naturally occurring minerals in rocks have a crystalline structure because they have a definite chemical composition which permits the atoms to be arranged in a specific ordered manner or fashion thereby making it the correct choice.
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The full question is:
Explain why naturally occurring minerals in rocks have a visible crystalline structure.
2. How many grams of oxygen are formed when 52 grams of aluminum chlorate are
decomposed (Al(ClO3)3)?
(6 pts. /2 pts. for equation - 3 pts. for stoich - 1 pt. final answer)
The mass of the oxygen that is formed from the decomposition of the aluminium chlorate is 27.4 g.
What is a decomposition reaction?We define a decomposition reaction as the kind of reaction that involves the break up of a substance so as to obtain the components of the substance.
The compound that is being broken up can be shown in the equation that we have below;
2Al(ClO₃)₃ → 2AlCl₃ + 9O₂
Thus
Number of moles of aluminum chlorate = mass/ molar mass
= 52 grams /277 g/mol
= 0.19 moles
If 2 moles of aluminum chlorate would form 9 moles of oxygen
0.19 moles of aluminum chlorate would form 0.19 moles * 9/2
= 0.855 moles
Mass of the oxygen = 0.855 moles * 32 g/mol
= 27.4 g
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select the glassware that must be used when preparing a dilute solution of known concentration from a stock solution of higher concentration: A) graduated cylinder beaker B) volumetric flask C) graduated cylinder, volumetric flask D) graduated pipet, Erlenmeyer flask E) graduated cylinder, beaker F) graduated pipet, volumetric flask
The glassware that must be used when preparing a dilute solution of known concentration from a stock solution of higher concentration is (F) graduated pipet and volumetric flask.
A graduated pipette is a pipette that has the volume marked along the tube in increments. It is employed to precisely quantify and transfer a liquid volume between containers. It has a tapering tip and is composed of glass or plastic tubes. Graduation markings along the tube's body show the capacity from the tip to certain points.
Volumetric flasks, also known as graduated flasks or measuring flasks, are pieces of laboratory glassware or plasticware that are calibrated and labeled to contain a particular volume of reagents, solvents, or any other liquids. Other names for volumetric flasks are measuring flasks and graded flasks. Chemical solutions are frequently made using volumetric flasks.
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Fill in my blanks
Mass - measured in ____ or tells the amount of matter in an object.
Volume - the amount of ____ that’s an odject _____ _____
Answer:
Mass - measured in kilogram or tell the amoout of matter in an object.
Volume - is the amout of space that's an object taken
HELP PLEASE NEED THIS RIGHT NOW!!!!
(03.02 HC)
Use the portion of the periodic table shown below to answer the questions.
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as magnesium (Mg). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of potassium (K). Explain how you determined your answer using complete sentences. (6 points) (10 points)
Two elements that have the same properties as magnesium are calcium and strontium.
The number of protons in potassium, K = 19
the number of electrons in potassium, K = 19
The number of neutrons in potassium, K = 20
What is the Periodic Table?The Periodic Table is a table that arranges the elements in order of increasing atomic number into vertical columns called groups and horizontal rows called periods.
Elements in the same period have the same number of electron shells or energy levels.
Elements in the same group have the same number of valence electrons or outermost shell electrons.
Considering the given data:
The elements in group 1 are sodium, potassium, and rubidium.
The elements in group 2 are magnesium, calcium, and strontium.
The elements in group 3 are scandium and yttrium.
The number of protons, electrons, and neutrons present in an atom of potassium (K) is determined by the atomic number and mass number of potassium.
Atomic number = number of protons
Number of proton = number of electrons in a neutral atom
Number of neutrons = mass number - atomic number
The atomic number of potassium = 19
mass number = 39
number of neutrons = 39 - 19
number of neutrons = 20
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Why do you think the Haití earthquake in 2010 happened?
Both Saturday's earthquake and the one in 2010 are thought to have been caused by the Enriquillo-Plantain Garden fault system, according to the United States.
What is the Haitian problem with the Enriquillo-plantain garden?The Enriquillo-Plantain Garden fault zone (EPGFZ or EPGZ) is indeed a network of active coaxial left lateral-moving strike - slip faults faults that extends along the southern coast of Hispaniola, the island that is home to Haiti and the Dominican Republic.
Where is the fault system between Enriquillo and Plantain Garden?
As one of Haiti's main plate-bounding fault systems, the Enriquillo-Plantain Garden fault zone is very well known. Initially believed to be the cause of the Mw 7.0 earthquake that struck Port-au-Prince on January 12, 2010, the strike-slip fault is located close to the city.
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According to the balanced equation below, how many moles of ClO−2(aq) are needed to react completely with 20. mL of 0.20 M KMnO4 solution?
In order for 20 mL of 0.20 M KMnO4 solution to completely react, 3 m.mol of chlorite anion are needed. by a redox process.
How to fix?Reduction
MnO−4+4H++3e−→MnO2(s)+2H2O(l) I (i)
Oxidation ClO2 + 2 H2 O + ClO4 + 4 H + 4 e (ii)
Overall
4×(i)+3×(ii)4MnO−4+3ClO−2+4H+→4MnO2(s)+3ClO−4+2H2O(l)
Moles of KMnO4 equal 20 10 3L, 0.20 mol, and 1 = 4.0 10 3mol.
According to the equation, we require 3/4 equiv (or 4.0 10 3 mol) of chlorite anion.
How can molarity be used to identify moles?Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in liters, is the most widely used unit to express solution concentration: liters of solution/moles of solute equals M. One liter of a solution with a 1 molar concentration (1.00 M) contains 1.00 moles of solute.
How does molality translate into moles?Moles of solute divided by kilograms of solvent equals molality. Adding moles of a solvent = 3 and mass of solvent = 0.5 kg , we obtain molality = 3 / 0.5 = 6 mol/kg .
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Multiple choice (please help)
Given chemical equation:
CuSO₄ + 2HI → Cu₂SO₄ + I₂ + H₂SO₄
CuSO₄ + 2HI - reactants (option - b) is correct.
A chemical equation consists of what components?A chemical equation is composed of the "yields" arrow, the "reactants," and the "products" components. Compounds or elements that are required for the reaction and go through chemical change while the reaction is occurring are known as reactants. Yield is typically represented by an arrow in reactions and refers to the ability to "produce" or "form."
Numerous observable factors, such as color change, energy change (such as a rise in temperature or the production of light), gas production, precipitate formation, and changes in physical properties, can be used to detect chemical reactions.
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Calculate the hydroxide ion concentration, [OH−] , for a solution with a pH of 7.08 .
Answer: [tex][\text{OH}^{-}}]=10^{-6.92} \text{ M}[/tex]
Explanation:
[tex]\text{pH}+\text{pOH}=14\\\\7.08+\text{pOH}=14\\\\\text{pOH}=6.92\\\\\\\text{pOH}=-\log([\text{OH}^{-}}])\\\\6.92=-\log([\text{OH}^{-}}])\\\\[/tex]
[tex][\text{OH}^{-}}]=10^{-6.92} \text{ M}[/tex]
Two north poles facing each other will ___ each other.
repel
attract
Answer: repel
Explanation: it's not yet known why like charges repel each other, so
but there's your answer, yw.
For the following reaction, 20.4 grams of sulfur dioxide are allowed to react with 9.97 grams of oxygen gas .
sulfur dioxide ( g ) + oxygen ( g ) sulfur trioxide ( g )
What is the maximum amount of sulfur trioxide that can be formed?
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete?
Answer:
1.3
Explanation:
Classify each chemical reaction as endothermic or exothermic.
You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Endothermic reactions
Exothermic reactions
Answer Bank
2H2(g)+O2(g)⟶2H2O(l)+heat2C2H2(g)+5O2(g)⟶4CO2(g)+2H2O(l)+heatCH4O(l)+heat⟶CO(g)+2H2(g)
2CO2(g)+heat⟶2CO(g)+O2(g)
Exothermic reactions are
1) 2H2+O2 ⇒2H20+Heat
2) 2C2H2+5O2⇒4CO2+2H20+Heat
Endothermic reactions are
3) CH4+Heat ⇒CO+2H2
4) 2CO2+Heat⇒2CO+O2
What are exothermic and endothermic reactions?
Exothermic reactions are those reactions in which energy is released and in endothermic reactions energy is required to proceed the reaction.
1) & 2) are exothermic because energy is released in reaction 3) & 4) are endothermic because energy is required so called endothermic reaction.
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During an investigation a scientist heated 2.76 g of silver carbonate till it decomposed to leave a silver residue. The total mass of the silver residue formed was 2.16 g. Does the law of conservation of mass hold true in this case?
The given statement "Does the law of conservation of mass hold true in this case?" is true because the the sum of the masses of A and B is equal to the mass of AB that reacts.
What is the law of conservation of mass?The law of conservation of mass states that mass can neither be created nor destroyed during the course of reactions but can however be converted to other forms during the course of reactions. Following this rule, if AB reacts to produce A and B, the sum of the masses of A and B must be equal to the mass of AB that reacts.
While the silver residue produced is a solid that is easily recoverable, the other two products are gases that could escape into the surrounding atmosphere unless specially collected or if the reaction is conducted in an enclosed space.
Thus, the fact that only 2.16 g of silver residue was formed does not mean that the law of conservation was not supported by the reaction. The remaining mass would be that of the gases that could have escaped during the course of the reaction.
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The NMDA receptor is a neurotransmitter- and voltage-dependent ion channel. When the _____ is at the resting potential, Mg2+ blocks the ion channel, preventing Ca2+ from entering.
Answer:
postsynaptic membrane
Explanation:
Hope it helps!
A sample of 200g of an isotope decays to another isotope according to the function
(a) How much of the initial sample will be left in the sample after 25 years?
(b) How long will it take the initial sample to decay to half of its original amount?
(a) After 25 years, about g of the sample will be left.
(Round to the nearest hundredth as needed.)
a. Around 0.50g would be left in the sample after 25 years.
How long will it take the initial sample to decay to half of its original amount?
The initial sample will take 5 years to decay to half of its original amountWhat is isotope?
Isotopes are atoms with the same number of protons but differing numbers of neutrons. They differ in mass, which affects their physical characteristics even if they have almost identical chemical properties.Give an example of isotope?
Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, having respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.To know more about isotopes checkout this link:
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AWARDING A LOT OF POINTS TO WHOEVER ANSWERS THESE (correctly)
1. How many moles is 55 g of NaCi?
2. How many moles is 0.025 g of NaCO3?
3.How many grams is 0.500 moles of NaCi?
1) The number of moles of the sodium chloride is 0.94 moles.
2) The number of moles of sodium carbonate is 2.4 * 10^-4 moles.
3) The mass of the sodium chloride is 29.25 g.
What is the number of moles?We know that we can be able to determine the amount of substance and that the unit of the amount of substance is the mole. The mole refers to the elementary entities that we can be able to find in the compound.
We can obtain the number of moles in each of the cases using the formula;
Number of moles = mass/ molar mass
Hence;
For sodium chloride;
55 g/58.5 g/mol
= 0.94 moles
For sodium carbonate;
0.025 g/106 g/mol
= 2.4 * 10^-4 moles
For the mass of the sodium chloride;
Mass = 0.500 moles * 58.5 g/mol
= 29.25 g
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What is the reaction equation for NaK or Sodium Metal and Potassium Metal
WILL GIVE BRAINLIEST
Sodium reacts faster, producing enough heat to melt itself and occasionally ignite the hydrogen gas, resulting in the characteristic yellow-orange flame of sodium. The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
What is potassium ?Potassium has the chemical symbol K and the atomic number 19. Potassium is a silvery-white metal that can be cut with a knife with little effort. In seconds, potassium metal reacts with atmospheric oxygen to form flaky white potassium peroxide.
Sodium and potassium, for example, react violently with cold water. These are exothermic reactions. The reaction is so violent and exothermic that the hydrogen produced instantly catches fire.
Thus, The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
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which of the following is a correct electron configuration for a neutral atom of carbon in the excited state g
A carbon atom's excited-state electrical configuration is 1s2,2s1,2p3, meaning that by absorbing energy, one electron from the 2 s orbital is excited to the 2 p orbital.
What is the carbon atom's neutral electron configuration?According to Hund's rule, the orbital diagram in c is assumed to match the electron configuration of carbon, which is 1s2 2s2 2p2. It is discovered experimentally that a neutral carbon atom's ground state does indeed contain two unpaired electrons.
Describe MOT through an example?picture relating to mot chemistry
One electron each is present in the 1-s orbitals of the two hydrogen atoms. Two different ways in which two hydrogen atoms can unite to create a bond are possible. The MO is in the other
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Predict the ground-state electron configuration of each ion. Use the abbreviated noble gas notation.
Cu²+
Co³ +
I got answers of:
Cu - [Ar]4s^2 3d^7 ; [Ar]3d^7 ; [Ar]3d^10 ; [Ar]4s^1 3d^10
Co - [Ar]4s^2 3d^4 ; [Ar]3d^4
And these were all wrong, please help
The electron configuration of Cu²+ ion - [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^9[/tex]
The electron configuration of Co³ + ion - [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^6[/tex]
What is the electron configuration?When we are talking about the electron configuration, we are talking about the way that the electron is arranged around the nucleus of the atom. We know that electrons in the atom can be arranged in energy levels in the atom of the element.
We are asked to write here the electron configuration of the copper II ion and that of the cobalt III ion. In either case, we have to know that electrons have been removed from the neutral atom. In the first case, there are two electrons that have been removed while in the second case, there are three electrons that have been removed.
Thus in writing the electron configuration of the specie we have to take into account the number of the electrons that have been lost due to ion formation. Recall that the ground state is the lowest energy state of the chemical specie.
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