Which of the following is a trait of group 18 (column 18)?
they are all stable metals

They are chemically stable gasses

They are all reactive
metals

They are a mix of reactive gasses and solids

Answers

Answer 1

Answer: They are chemically stable gases

Explanation:

Group 18 is also called the noble gases - because they have full valence shells it means they are stable and won't chemically react.


Related Questions

Why can a solution be classified as a mixture?

Answers

Answer:

A. It is made up of only one substance

Explanation:

How to draw a covalent bonding plz help ppl

Answers

Explanation:

A single covalent bond is made up of 2 electrons (one from each atom). It is represented with a single line.

Each line is represented as one dot and one cross (. x)

A double covalent bond is made up of 4 electrons (2 from each atom). It is represented using 2 lines. As dot and cross, it will be represented with 2 dots and 2 crosses.

A triple covalent bond is made up of 6 electrons (3 from each atom). It is represented using 3 lines. As dot and cross, it will be represented with 3 dots and 3 crosses.

Know the number of electron (s) needed by the atom to have noble gas configuration / stable (Key: You should know your electron arrangement / group number / Refer to table provided)*.

Groups and the number of electrons needed for atoms to have noble gas configuration or have full outer shell(s).

Group 4: Four (4) electrons needed for the outer shell to become full / noble gas configuration;

Group 5: Three (3) electrons needed by the atom to have a full outer shell / noble gas configuration;

Group 6: Two (2) electrons needed

Group 7: One (1) electron needed

A scientist was studying layers of earth in the side of a mountain. In the lower layers, she found fossils of reindeer and polar bears. In the upper layers, she found fossils of coyotes and squirrels. Which conclusion most likely explains the different fossils?
Group of answer choices

The climate was very cold in earlier time periods and became warmer in later time periods

The climate was very hot in earlier time periods and became colder in later time periods.

The climate was wet in earlier time periods and became drier in later time periods.

The climate was dry in earlier time periods and became wetter in later time periods.

Answers

Answer:

The climate was very hot and became colder in later time periods.

Answer:

The climate was very hot in earlier time periods and became colder in later time periods.

What level of ecological organization so all the owls in a certain area represent?

Answers

The owls in the certain area located in the picture represent a population, they are formed up as a small group of animals representing a small species.

The level of ecological organization that all owls in a given area represent is the population of owls in a given area.

What is ecology?

In ecology, the organism, population, community, ecosystem, and biosphere are among the levels of organization. A population is a collection of creatures from the same species that coexist in one location and communicate with one another.

Researchers in the field of ecology focus on five major levels: organism, population, community, ecosystem, and biosphere. These levels are sometimes studied separately and other times they overlap. Let's examine each stage one by one.

The owls in the particular location shown in the image are a population; they are made up of a few individuals representing a single small species.

To learn more about Ecology refer to:

https://brainly.com/question/949008

#SPJ2

Why can't you squeeze a sealed plastic syringe that is completely filled with water??

Answers

Answer:

Water has less compressibility. When you squeeze it, it has no place to escape.

Explanation:

What is a chemical formula?

Answers

Answer:

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

Explanation:

Which of the following is a INCORRECT ionic compound formula?
MgO
Na20
MgCl
NaCl

Answers

Answer:

Na2O

explanation.

Ionic bonds refers to complete transfer of electrons from one atom to another

Name the 3 elements, in order, that make up a very important part of Thanksgiving. (Spell out a word with chemical symbols)

Answers

Answer:

eat well, stay well, and have fun ∛π⇅πΔΔΔ≅≅⇵↑↓∫∫↑

Explanation:

Answer:

Chemical element symbols are one- and two-letter abbreviations for the element names. They are used to make the periodic table and chemical formulas easier to read. You can combine the symbols to make words. Here is a list of English words made from periodic table element symbols. There are thousands of words that can be written using these symbols, so experiment to see if you can write your name or fun messages that show your chemistry savvy.

Hormones are secreted by glands in the human body. The hormones control different functions of the body by targeting specific organs and controlling the way their cells work. Which organ system is made of these hormone-producing glands?

Answers

Answer:

Bb

Explanation:

PLEASE, PLEASE HELP ME!!!

4 Fe + 3 02 --------------- 2 Fe2 O3

In this chemical equation, why is the number of atoms the same on each side of the arrow?

Chemical reactions reduce matter but create energy.
Chemical reactions produce new matter.
Matter cannot be created or destroyed.

Answers

Answer:

Matter cannot be created or destroyed.

Explanation:

According to law of conservation of matter, Matter can neither be created nor destroyed. It just gets converted into other forms.

So, It's important to equalize the no. of moles on either side of the chemical reaction.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

~AnonymousHelper1807

please help question is in photo will give brainiest

Answers

Answer:

D

Explanation:

A balloon contains 3.20 L of helium. The pressure is reduced to 59.0 kPa, and the
balloon expands to occupy a volume of 5.50 L. What was the initial pressure exerted on
the balloon?

Answers

Answer:

101.4pKa

Explanation:

Given parameters:

Initial Volume of helium  = 3.20L

Final pressure of helium  = 59kPa

Final volume on helium gas = 5.5L

Unknown:

Initial pressure exerted on the balloon = ?

Solution;

To solve this pressure - volume problem, we simply apply the Boyle's law.

It states that "the volume of a fixed mass gas varies inversely as the pressure changes if the temperature is constant".

  Mathematically;

         P1 V1  = P2 V2

Now, insert parameters and solve;

         P1 x 3.2 = 59 x 5.5

          P1  = 101.4pKa

Can someone help me with this?-- 15 pts!

2H2 + O2 → 2H2O

At the beginning of the reaction, it is measured that there are 15.0 g of hydrogen (H2) and 97.0 g of oxygen (O2).

What is the theoretical yield for the water that will be produced in the reaction? (M H2O = 18.0 g/mol; M CH4 = 16.0 g/mol)

2.73 x 101 g H2O
1.34 x 102 g H2O
1.08 x 102 g H2O
5.38 x 100 g H2O

Answers

Answer:

1.08 x 10^2 gm of H2O

Explanation:

number of moles of O2 = 97g /32 g/moles = 3.03 moles

3.03 moles of O2 produces 6.06 moles of H2O

amount of water produced = 6.06 mol x 18 g /mol = 109.08 g = 1.08 x 10^2 g

Which of the following elements has the lowest ionic radius?

Answers

Answer:Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest. So the asnwer is helium

Explanation:

Which statement best describes the physical properties of solid, liquid, and gas fuels?

-Solids and liquids decompose and transform into non-flammable vapors when exposed to their ignition point.
-The vapors produced by decomposed fuels combust into flames when heated to their flammable point.
Which statement best describes the physical properties of solid, liquid, and gas fuels? -Liquid fuels take longer to ignite than solid or gas fuels.
-Liquid fuels require the least amount of time to ignite.

Answers

Answer:

I did not understand

i donot know it is correct

(i think 2 one is the best)

Explanation:

Write a balanced chemical equation for the following: magnesium metal is burned in oxygen to produce magnesium oxide.

Answers

A balanced chemical equation for burning Magnesium

2Mg(s)+O₂(g)⇒2MgO(s)

Further explanation

Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction(syntesis / combination)

Mg(s)+O₂(g)⇒MgO(s)

give coefficient

aMg(s)+bO₂(g)⇒MgO(s)

Mg, left=a, right 1⇒a=1

O,left=2b,right 1⇒2b=1,b=0.5

Mg(s)+0.5O₂(g)⇒MgO(s) x 2

2Mg(s)+O₂(g)⇒2MgO(s)

If you have a mole of boron and a mole of carbon would they have the same number of
atoms in each mole? Please help ❤️

Answers

Answer:. that contains the same number of entities as there are atoms in 12 g of carbon-12. ... the same as the mass of one mole of the compound in grams. • Skill 3-1 Calculate the ... Molar mass has units of grams per mole (g/mol). Concept 3. ... of moles to mass: •We can do the reverse with 1/M, and convert any mass in grams to.

Explanation:

The number of atoms in a mole of boron and carbon is required.

A mole of carbon and a mole of boron have the same number of atoms.

The unit of amount of substance is called mole.

[tex]1\ \text{mole}=6.022\times 10^{23}\ \text{atoms, molecules, ions, or electrons}[/tex]

So, 1 mole of any element, whether it be carbon or boron has the same number of atoms which is [tex]6.022\times 10^{23}[/tex].

Learn more:

https://brainly.com/question/20484279

https://brainly.com/question/1731823

what is mass in grams of 175 mL of salt water with a density of 1.30 g/cm3

Answers

Answer:

Answer: 227.5 grams

Explanation:

Answer:

227.5

Explanation:

Acellus

what process will decrease the level co2 in the atmosphere

Answers

Answer:planting more trees

Explanation:

Trees go through photosynthesis and uses carbon dioxide (CO2) and changes it to oxygen

Photosynthesis

Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2. However, these processes are not in balance.

Which of the following instruments is a combination of a percussion and a stringed instrument?

A) saxophone

B) piano

C) oboe

D) tambourine

Answers

Answer:B

Explanation:

Consider the reaction between 75.5 mL of 0.247 M barium hydroxide and 95.0 mL of 0.330 M HCl. Find the mole ratio of hydrochloric acid to barium hydroxide, compare to the theoretical one, and determine the limiting reactant.

Answers

Answer:

Explanation:

Ba( OH)₂ + 2HCl = BaCl₂ + 2H₂O .

75.5 mL of 0.247 M barium hydroxide = .0755  x .247 = .01864 moles

95.0 mL of 0.330 M HCl = .095 x .33 = .03135 moles

mole ratio of  hydrochloric acid to barium hydroxide

= .03135 /  .01864 = 1.68

theoretical ratio = 2 /1 = 2

As the theoretical ratio is more , therefore HCl is the limiting reactant  .

Identify the isotope that has atoms with 28 neutrons, 23 protons, and 23 electrons

A. ^28 Ni
B. ^23 V
C. ^23 Mn
D. ^51 Sb
E. ^51 V

Answers

Answer:

E. ^51 V

Atomic number (number of protons in the nucleus): 23

Atomic symbol (on the periodic table of the elements): V

Atomic weight (average mass of the atom): 50.9415

Density: grams per cubic centimeter

Phase at room temperature: Solid

Melting point: 3,470 degrees Fahrenheit (1,910 degrees Celsius)

Boiling point: 6,165 F (3,407 C)

Number of isotopes (atoms of the same element with a different number of neutrons): 2; one stable V-51; one radioactive V-50

Most common isotopes: V-51 (99.75 percent natural abundance)

When HNO3 and Au are mixed together, what do you expect to happen, and why?

No reaction, because Au is above H on the activity series and they cannot react
No reaction, because Au is lower on the activity series and cannot replace H
They form Au(NO3)2 and H2, because Au is more reactive and able to replace H
They form Au(NO3)2 and H2, because they trade places in a double replacement reaction

Answers

Answer:

B

Explanation:

There can be no reaction because Au is above H on the activity series and cannot react.

Answer: B is correct

Explanation: I took the quiz

AYOSOMEONEHELPMEWITHTHESETWOMULTIPLECHOICEQUESTIONS

I’ll give a brainest

Answers

Answer:

b. close to 0 degree celsius

Explanation:

100 g * ( x-0)= 500 g * ( 25-x) , where x is the new temperature reached

if we solve for x , we get 20 degree celsius

i.e. the temperature of ice increases to 5 degree celsius and the temperature of water drops to 5 degree celsius

hope it helps.

Read the hypothesis below. Hypothesis: if a steel surface is wet with water, then the friction will be reduced, which question best matches the hypothesis ???

Answers

Answer:

how will water affect the force of friction

90% sure

NEED ASAP PLS!!

What important contribution did Einstein make concerning the relationship between energy and matter?
a.) A small amount of matter can be changed into a huge amount of energy
b.) A small amount of energy is created when large amounts of matter is changed
c.) The creation of energy will result in matter
d.) Matter can never be created

Answers

Answer: It is a

Explanation:

Which element rarely reacts because it has 8 electrons in its outer shell?
A. Bromine
B. Xenon
C. Arsenic
D. Potassium

Answers

Answer:

B. Xenon

Explanation:

A.P.E.X

According to the electronic configuration,the element which rarely reacts is xenon as it has 8 electrons in it's valence shell.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

https://brainly.com/question/14283892

#SPJ5

how do i do this question please help me

Answers

Answer:

3

Explanation:

The reaction is given as:

           H₂S   +   O₂   →  SO₂    +    H₂O

Let us balance the chemical equation.

 We take some letters and we use them as the coefficient to balance the equation;

          aH₂S   +   bO₂   →  cSO₂    +    dH₂O

Now,

  Conserving H;

         2a  = 2d

 Conserving S;

         a = c

 Conserving O;

        2b  = 2c + d  

Let a  = 1, d  = 1, c  = 1, b  = [tex]\frac{3}{2}[/tex]  and multiply through by 2;

    a = 2, b  = 3, c  = 2 and d = 2

So, the balanced reaction equation is given as;

    2H₂S   +   3O₂   →  2SO₂    +    2H₂O

What is the energy (in joules) and the wavelength (in meters) of the line in the spectrum of hydrogen that represents the movement of an electron from Bohr orbit with n = 3 to the orbit with n = 5?

Answers

15 I think because of what you ask I’m a college student so yea

water in a plate disappear after some hour when it is kept in the sun why​

Answers

Answer:

This happened because of evaporation, the sun evaporated the water.

Answer:

Because if you place the plate filled with water in the sun then a small amount of water will be dried up by the sun's heat.

Other Questions
The position taken by the writer of this letter is thatA) she needs to find a job to save money for college.B) she wants to learn the skills to be a sales-person.C) she wants to work in a store that sells clothing forteens.D) she is confident that she has the skills to do the jobeffectively.Business LetterCarole Jenkins412 Rocky Hill RoadAtlanta, Georgia 30030May 3, 2007Personnel ManagerTogs for Teens2193 Peachtree CourtAtlanta, Georgia 30306Dear Sir or Madam(1) I am responding to your advertisement in the May 1, 2007, issue of the Atlanta Journal Constitution for a full-time salesperson for summeremployment. (2)I am very much interested in being considered for this position. (3) It would be really exciting to work in a store that sells clothes for teens.(4)I am a junior in high school where I am vice Find the total cost to the nearest cent.$49.95 pair of shoes; 5% tax Match the job titles with the job descriptions.A. federal aid coordinatorB. corrections officerC. paralegalAssist an attorney in research and administrative tasks.Evaluate student applications for financial aid.Supervise the management of a prison facility.HELP ASAP Which event in Franz Kafkas The Metamorphosis can be considered surreal? A manufacturing process produces items whose weights are normally distributed. It is known that 22.57% of items produced weigh between "100 grams and the mean" weight 49.18% weigh between the "mean and 190 grams." Find the equation of the line that passes through the following two points: (3, -7) and (7, 2) What role is being played by the president dealing with domestic and foreign affairs?- this is for my government class btw- What is 11/33 in the simplest form PLS ANSWER QUICK ONLY IF U KNOW IT ALSO I WILL MARK BRAINLIEST If g(x)=4x-5 find g(-3). Choose the sentence showing correct use of capital letters.Group of answer choicesAlbert Einstein once said that gravitation "Cannot be held responsible for people falling in love.""Gravitation," Albert Einstein once said, "Cannot be held responsible for people falling in love.""Gravitation," Albert Einstein once said, "cannot be held responsible for people falling in love." Glycolysis is the first stage of cellular respiration and is an anaerobic process. During glycolysis, glucose is converted to two molecules of pyruvicacid. How is glycolysis kept functioning during cellular respiration?A Two high-energy electrons are passed to the carrier NADH, which transports electrons back to glycolysis.OB. Two molecules of ATP from the cell are invested at the beginning of the process of glycolysis.C. Pyruvic acid from glycolysis reacts to form acetyl-CoA, which then combines with a four-carbon compound in the Krebs cycle and re-entersglycolysis.D. Hydrogen ions pass back across the mitochondrial membrane through chemiosmosis and re-enter glycolysis. the father in the story of metamorphosis was a? A bakery has 18 large trays of bagels and 20 small trays of bagels. Each large tray holds 30 bagels and each small tray holds 15 bagels.Which equation could be used to find n, the total number of bagels the bakery has?18 30 + 20 15 = n18 + 30 + 20 + 15 = n18302015=n18 + 30 20 + 15 = n] How does biodiversity affect an ecosystem's ability to stabilize when its climate changes? WILL MARK BRAINLIEST Which two events do you think are the most important in the history of journalism? Explain your answer. Which of the following is NOT a right of citizen states wrote into their constitutions?1. right to vote in elections2. trial by jury 3.protection from taxes 4. protection from cruel and unusual punishment Which continent is on the same landmass as Europe? Which system was important to the hierarchy of feudalism in medieval Japan?lordvassalmilitary ruleshogunatebushido I am accessible in many locations on Earth, but I am not exactly reliable. I am a big fan of open space especially near the coast, but that land is usually expensive. Technology used to harness/convert me can create a lot of noise, and some people dont think it is very attractive. Sara used a number line to add. She started counting at 10, and then she counted until shewas over the number -4 on the number line. If Sara is modeling addition, what number didshe have to add to 10?