Assume the Bohr model to determine the radius of the n = 8 orbit in a N6+ ion.
r = ? pm
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What is the energy in joules of a photon with a frequency of 7.95e+14 s-1? What is the energy in kilojoules of a mole of photons of this frequency? Express you answers to three significant digits.
E of single photon = ? J
E of mole of photons = ? kJ/mol
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Be carefull of the sign of your answers and express your numerical answers to four figures.
a) What is the energy of the n = 5 level of a H atom? J
b) What is the energy of the n = 9 level of a H atom? J.
c) What is deltacap.gifE for the n = 5 to n = 9 transition? J

A substance that is present in a gaseous state at room temperature would be between groups 13 to 18 on the periodic table because it is a non-metal. Option 4.

Gaseous elements are elements that are in gaseous states at room temperature. They are usually found concentrated in the upper right corner on the right side of the periodic table.

Some of the gaseous elements include elements in group 18 which are collectively known as the noble gases, nitrogen in group 15, oxygen in group 16, and so on.

Even though some elements that exist as gases at room temperature can be found in other groups outside of groups 13 to 18, gaseous elements are concentrated between the referenced groups.

In other words, a substance that is present in the gaseous state at room temperature will most likely be between groups 13 to 18 of the period table.

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The probability that a randomly selected pill contains at least 500 mg of calcium 1 - P(X < 500) = 1 - P(Z < 0.833).

The probability that a randomly selected pill contains at least 500 mg of calcium can be found by using the CDF of the normal distribution with a mean of 490 and a standard deviation of 12, and subtracting the probability that a pill contains less than 500 mg of calcium from 1.

We can use the cumulative distribution function to find the probability of X < 500, this would be the probability that a pill contains less than 500mg of calcium.

The probability of X < 500 = P(X < 500) = P(Z < (500 - 490)/12) = P(Z < 0.833)

Where Z is a standard normal variable. This is equivalent to the area under the standard normal distribution curve to the left of Z = 0.833.

To get the probability of X >=500, we subtract the probability we just calculated, from 1, that is:

1 - P(X < 500) = 1 - P(Z < 0.833)

This will give us the probability that a randomly selected pill contains at least 500 mg of calcium.

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1 - P(X 500) = 1 - P(Z 0.833) is the probability that a randomly chosen tablet contains at least 500 mg of calcium.

Using the CDF of the normal distribution with a mean of 490 and a standard probability of 12, one can calculate the likelihood that a randomly chosen calcium pill has at least 500 mg of calcium by subtracting the likelihood that it contains less calcium from 1.

We can calculate the likelihood that X 500, or the likelihood that a pill calcium contains fewer than 500 mg of calcium, using the cumulative distribution function.

The odds of X exceeding 500 are P(X exceeding 500) = P(Z (500 - 490)/12) = P(Z 0.833)

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The major byproducts of the chemical reaction between sodium sulphide and 1,4-dibromobutane are thiolune and sodium bromide.

The complete question:

"Identify the primary product of the following reaction: + Nas? + 2NaBr Br Br. c. Br co."

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The balanced chemical equation is given as :

3Cl₂(g)   +  6NaOH(aq)   ----->   5NaCl(aq)  +  NaClO₃(aq)   +   3H₂O(l)

The chemical reaction is given as :

Cl₂   +  NaOH   ----->   NaCl  +  NaClO₃   +   H₂O

          reactant     product

Cl           2                   2

Na           1                   2

O              1                  4

H            1                    2

To balance the chemical equation , multiply 3 in Cl₂ , 6 in NaOH , 5 in NaCl and 3 in H₂O, we get :

3Cl₂(g)   +  6NaOH(aq)   ----->   5NaCl(aq)  +  NaClO₃(aq)   +   3H₂O(l)

Now the equation is balanced as to balanced equation ,the number of the atoms in the reactants side is equals to the number of the atom in the product side.

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A  sample of sodium hydroxide (NaOH) has a mass of 160.0 g and molar mass of 40g/mol so the moles will be 4 moles.

A mole is defined as the mass of the substance which consists of the equal quantity of basic units.The basic units can be molecules, atoms or formula units based on the substance.

The data from the question is as follows

Mass of NaOH = 160g

molar mass of NaOH =40 g /mol

The formula for the number of moles formula is expressed as

Number of Moles = [tex]\frac{Mass of substance }{ Mass of one mole}[/tex]

no. of moles = [tex]\frac{m}{MM}[/tex]

So by putting values in the given formula we will get the answer

no. of moles =[tex]\frac{160}{40}[/tex]

no.of moles = 4mol

So moles of NaOH does this sample contain is 4 mol

Your question is incomplete most probably your full question was

A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?

A) 4.000

B) 40.00

C) 160.0

D) 6,400

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The standard cell potential for the equation is 1.89V.

The potential of a cell at its standard state, which is roughly represented by concentrations of 1 M and pressures of 1 atm at 25 C, is known as the standard state potential. For the cell, write the oxidation and reduction half-reactions.

The equation given is

[tex]Mg(s)+Fe^{2}(aq)- > Mg^{+2}(aq)+Fe(s)[/tex]

Here, magnesium acts as an anode because it loses electrons during oxidation. Iron acts as a cathode when it undergoes reduction by gaining electrons.

Now, the formula to calculate the standard potential cell is

[tex]EMF=E^{o} _{cathode} -E^{o} _{anode}[/tex]

Now, here standard potential of magnesium is -2.38V

and standard potential of iron is -0.49V

which gives,

EMF=-0.49+2.38

EMF=1.89V

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The structure which referred to peroxide is ROOR, ROOH, RCOOOCOR.

All the three structure show peroxide because in all the structure two oxygen atom is connected with single covalent bond.

Peroxides are a class of chemical compounds with the formula R-O-O-R, where R can be any element. The peroxide group, also known as the peroxo group, is the O-O group found in peroxides. The nomenclature varies to some extent. Hydrogen peroxide, also referred to as "peroxide," is the most prevalent peroxide.

Hydrogen peroxide is an antiseptic liquid that is often used to treat cuts or other skin wounds and kill germs. It comes in a brown bottle. However, peroxide is frequently employed in non-medical contexts, such as for stain removal, cleaning, and disinfection.

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Diastereomers is the relationship between the following two molecules HOH.

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Answer:

Chemical reaction

Explanation:

This process is called a chemical reaction. A chemical reaction is where atoms are rearranged to create various compounds, so the atoms can either be formed or broken.

For example, in this equation for the formation of water:

2H2(g) + O2(g) → 2H2O(l)

Here hydrogen and oxygen both combine to form water. This new compound, water, that has formed is what makes it a chemical reaction.

In this equation for the decomposition of calcium carbonate:

CaCO3(s) → CaO(s)+ CO2(g)

Here, CaCO3 has been broken down into CaO and CO2, which takes place as a chemical reaction.

As the elements of Group 16 (VIA) are considered from top to bottom on the Periodic Table, the covalent radii decrease and the ionization energies decreases.

What is Periodic Table?
The Periodic Table of Elements is an arrangement of all known chemical elements, arranged in order of atomic number, from the lightest (hydrogen) to the heaviest (uranium). The table is organized into rows and columns, with each element having its own unique properties. Elements are arranged according to their atomic number, number of protons, and electron configuration. The table also has information about the element’s chemical symbol, atomic mass, and physical properties. The Periodic Table helps scientists understand the structure of atoms, predict their chemical reactions, and the characteristics of their compounds. It also allows scientists to compare how elements interact with each other to form new substances.

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The pressure of the helium gas in units of atm would be 3.93 atm

The ideal gas law is represented by the following equation:

PV = nRT

Where:

In this case, n = mass/molar mass = 4.55/4 = 1.1375 mol

V = 7.08 L

R = 0.083

T = 22+273 = 295 K

P = nRT/V

   = 1.1375x0.083x295/7.08

   = 3.93 atm

Thus, the pressure of the helium gas would be 3.93 atm.

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Drawing conclusions is the process of making sense of information that has been hinted at or implied. As a result, the information is seldom given in an obvious way.

To arrive at trustworthy findings, careful evidence collecting, analysis, and judgements that can withstand scrutiny are required. As an author, you are presenting your findings for readers to assess, thus you must be compelling based on the information you present in your piece.

Posing a sound question, formulating a working hypothesis, conducting research, identifying and controlling factors, recording observations during testing, gathering data, and drawing conclusions are all necessary steps. If you use spec sheets, diagrams, and graphs, your results are simpler to organise and present.

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Records of each controlled substance dispensed, received, or destroyed at the facility where you work must be available for review. The time for which the records is taken care of depends on person to person.

Maintain Controlled Substance Records The licensee/registrant must maintain applicable, accurate records in a secure storage location for two (2) years from the date of last transaction. All records must be readily available for audit purposes to U-M, the State of Michigan, or DEA Diversion Investigators. we have to manage time to our fullest so that we can use it to our benefit and make good benefit to it. by which information we can particularly consider that records of each controlled substance dispensed, received, or destroyed at the facility where you work must be available for review. The time for which the records is taken care of depends on person to person.

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According to the molecular geometry, the shape of of compound with central sulfur atom with two unshared pairs of electrons and single bonds to two hydrogen atoms is V-shaped and bond angle is 92.1 °.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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In the case of CuCl2, the oxidation number of Cu is +2 and the oxidation number of each Cl is -1.

What do you mean by oxidation number?

An oxidation number (also known as oxidation state) is a number that represents the degree of oxidation of an atom in a chemical compound. Oxidation numbers are used to indicate the oxidation state of an element in a chemical compound. They are assigned based on a set of rules, and can be positive, negative, or zero.

The oxidation number of an element in a compound is the charge that the element would have if the compound were composed of ions. In the case of CuCl2, the oxidation number of Cu is +2 and the oxidation number of each Cl is -1.

In CuCl2, Copper is a transition metal and it forms a cation (Cu2+) and each chlorine forms an anion Cl-. The total charge of the compound is zero, so the sum of the oxidation numbers of all the elements in the compound must be equal to zero. Therefore, Cu has an oxidation number of +2 and each Cl has an oxidation number of -1.

Hence, in the case of CuCl2 the oxidation number of Cu is +2 and the oxidation number of each Cl is -1.

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Answer:

58.29 g/mole (or 58.3 g/mole for 3 sig figs)

Explanation:

The term molecular, or molar mass of an atom or molecule is the number of grams of that substancce that is required to provide Avagadro's number of particles (atoms/molecules) of that substance.  If 0.0275 mole weighs 1.603 grams, we can find the molar mass by dividing the two given values:

  (1.603 grams)/(0.0275 moles) = 58.29 g/mole.

Note that the division of grams by the moles yileds the correct unit:  grams/mole.  The division essentially tells us how many grams are in one mole of the substance.

The molecular mass of milk of magnesia if 0.0275 mol weighs 1.603g is 58.29g/mol.

Molecular mass refers to the mass of an individual molecule of an element or compound.

The molecular mass of a substance can be calculated by dividing the mass of that substance by the number of moles it contains as follows:

molecular mass = mass ÷ no of moles

According to this question, 0.0275 moles of magnesia weighs 1.603g. The molecular mass can be calculated as follows:

molecular mass = 1.603g ÷ 0.0275moles

molecular mass = 58.29g/mol

Therefore, 58.29g/mol is the molecular mass of magnesia.

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The number of atoms in 16.25 g of Al is calculated here. One mole or 26.98 g of Al contains 6.022 × 10²³ atoms. Thus, the atoms in 16.25 g or 0.60 mol of Al contains 3.62 × 10²³ atoms.

Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Therefore, one mole of every substances contains Avogadro number of atoms. The mass of one mole of an atom is called its atomic mass.

Al is 13th element in periodic table. Its atomic mass is 26.98 g/mol. Thus, the  number of moles of 16.25 g of Al is calculated as follows:

no.of moles = given mass/atomic mass

                    = 16.25/26.98 =0.60 moles.

1 mole of Al contains 6.022 × 10²³ atoms. Thus, 0.60 moles contains 6.022 × 10²³ × 0.60 =  3.62 × 10²³ atoms.

Therefore, to calculate the number of atoms in a given number of moles of an element multiply the number of moles with Avogadro's number.

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Options i, iii are correct. Chiral molecules are molecules that are non-superimposable mirror images of each other, often referred to as "left-handed" and "right-handed" molecules.

Out of the given molecules, the following are chiral:

I. 2-Chlorobutane: This molecule has a chiral carbon atom, which is the carbon atom that is bonded to the chlorine atom and also to two other carbon atoms. III. 1-Bromo-2-methylpropene: This molecule has a chiral carbon atom, molecules which is the carbon atom It's worth noting that even though the molecule has no chiral atoms, it could still be chiral if the molecule is not symmetrical. that is bonded to the bromine atom and also to the double bond.

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The standard reduction potential for the reduction half-reaction of Cu(III) to Cu(II) is 0.608V.

E = 1.128V - 0.52V = 0.608V

The standard reduction potential for the reduction half-reaction of Cu(III) to Cu(II) can be calculated by subtracting the standard reduction potential for the reaction Cu3+ + 2e- ---> Cu+ (E4) from the standard reduction potential for the reaction Cu3+ + 2e- ---> Cu(s) (E3). Thus, the standard reduction potential for the reduction half-reaction of Cu(III) to Cu(II) is E = 1.128V - 0.52V = 0.608V.

The standard reduction potential for the reduction half-reaction of Cu(III) to Cu(II) is 0.608V.

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A refrigerator delays the spoilage of food by slowing down the rate of chemical reactions within microorganisms. Therefore, option B is correct.

The term chemical reaction is defined as the processes, in which substances undergo a chemical change to formed new substances, with all new properties.

Higher temperatures often result in faster chemical reactions. When food is left on the kitchen counter, it can soon become bad. The process is slowed down by the refrigerator's lower temperature, which allows the same food to stay fresh for longer.

Bacteria, molds, and yeasts are all potential sources of microbial deterioration. Food's water activity plays a significant role in determining the type of food decomposition that results.

Thus, option B is correct.

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Nitrogen is the most abundant component of the atmosphere in terms of volume. This means that nitrogen makes up the largest part of the atmosphere in terms of volume compared to other components.

Nitrogen is an extremely important component of the atmosphere, making up 78% of the atmosphere in terms of volume. This means that nitrogen is the most abundant component of the atmosphere when looking at volume. This abundance of nitrogen is due to the fact that the atmosphere is made up of mostly nitrogen and oxygen. Nitrogen is used to create the majority of the air we breathe, and is essential for life on Earth. Nitrogen also plays an important role in the global climate, as it is a key component of the Earth's greenhouse gases. It helps regulate temperatures and also helps protect the planet from the damaging effects of the sun's radiation. Nitrogen is essential for all living things, making it an incredibly important component of the atmosphere.

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The volume of the hydrogen gas is 17.6 L.

We know that the volume of the hydrogen that we can get using the stoichiometry of the reaction and that is what we are going to do here. We can see that from the question, we have;

Number of moles of the Arsenic = 39.3g /75 g/mol

= 0.524 moles

We have;

2 moles of arsenic produces 3 moles of hydrogen

0.524 moles of arsenic produces x moles of hydrogen

x = 0.524 moles * 3 moles/ 2 moles

= 0.786 moles

Mass of the oxygen =  0.786 moles * 22.4 L

= 17.6 L

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Answer: 1 absolute zero

2. melting point

3.Sublimation

4.

5.Molecule

6. element

7.plasm

8.homogenous mixture

9.celsius

10. Liquid

11.catenation

12deposition

13.

Explanation:

Answer:

Hot chocolate powder dissolves more quickly in hot water because it is a liquid at room temperature.

Explanation:

When you pour cold milk into hot cocoa, the milk and cocoa particles start to collide When a high-energy cocoa particle hits a low-energy milk particle, energy transfers. The cocoa particles slow down, and the cup of cocoa cools down.

The answer given in the question is option a, which is the average molecular mass of bromine, which is 79.9 amu.

Isotopes are atoms that possess the same atomic weight but differing numbers of neutrons. They differ in mass and hence in physical qualities, although having nearly identical chemical properties.

Atomic mass of bromine = ?

Percent abundance of 1st isotope = 50.7%

First isotope's atomic mass is 78.92 amu.

Percent abundance of 2nd isotope = 49.3%

Atomic mass of 2nd isotope =80.92 amu

Average atomic mass is equal to the product of the atomic masses of the first and second isotopes, divided by 100.

Average atomic mass = (50.7×78.92)+(49.3×80.92) /100

Average atomic mass = 4001.24 + 3989.36 / 100

Average atomic mass = 7990.6 / 100

Average atomic mass = 79.9 amu.

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The Complete Question :

What is the atomic mass of bromine, given the atomic masses and percent abundance of the two isotopes are 78.92 amu (50.7%) and 80.92 amu (49.3%)?

Select one:

a. 79.9 amu

b. 78.9 amu

c. 80.9 amu

d. 35 amu

The answer given in the question is option a, which is the average molecular mass of bromine, which is 79.9 amu.

Isotopes are atoms that possess the same atomic weight but differing numbers of neutrons. They differ in mass and hence in physical qualities, although having nearly identical chemical properties.

Given that,

Percent abundance of 1st isotope = 50.7%

First isotope's atomic mass is 78.92 amu.

Percent abundance of 2nd isotope = 49.3%

Atomic mass of 2nd isotope =80.92 amu

Atomic mass of bromine = ?

Average atomic mass is equal to the product of the atomic masses of the first and second isotopes, divided by 100.

Average atomic mass = (50.7×78.92) + (49.3×80.92) / 100

Average atomic mass = 4001.24 + 3989.36 / 100

Average atomic mass = 7990.6 / 100

Average atomic mass = 79.9 amu.

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The correct name for Ba3(PO4)2 is barium (III) phosphite. The name reflects the fact that the compound contains three barium cations and two phosphate anions, with the barium cations having an oxidation state of +3.

Chemical nomenclature is the formal system of naming chemical compounds. It is based on certain rules and conventions, and allows scientists to quickly and accurately identify and communicate the structure and composition of a compound.

The rules of chemical nomenclature vary depending on the type of compound, but generally involve assigning the correct prefix, suffix, and stem to the compound. The prefix indicates the type of element present in the compound, the stem indicates the number and arrangement of the atoms, and the suffix indicates the type of bonding and the type of compound. For example, the name for H2O is "dihydrogen monoxide" because the prefix "di" indicates two atoms of hydrogen, the stem "hydrogen" indicates that the compound contains hydrogen atoms, and the suffix "oxide" indicates that it is an oxide compound.

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Potassium (K) forms compounds KN, K₂O and KF with N, O and F element respectively.

Potassium nitride (KN) - Potassium (K) combines with nitrogen (N) to form potassium nitride (KN). The chemical formula for this compound is KN. Nitrides are compounds containing the nitrogen anion (N3-).

Potassium oxide (K2O) - Potassium (K) combines with oxygen (O) to form potassium oxide (K2O). The chemical formula for this compound is K2O. Oxides are compounds containing the oxygen anion (O2-).

Potassium fluoride (KF) - Potassium (K) combines with Fluorine (F) to form potassium fluoride (KF). The chemical formula for this compound is KF. Fluorides are compounds containing the Fluorine anion (F-).

Potassium is an alkali metal, and it forms ionic compounds with non-metals such as Nitrogen, Oxygen, Fluorine which are highly electronegative elements, these compounds are formed through the transfer of electrons from Potassium to Nitrogen, Oxygen, Fluorine which results in the formation of K+ and N3-,O2-,F- ions respectively.

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The balanced chemical equations for the combustion of hydrocarbons are as follows:

.2 C₂H₆ + 5 O₂ ---> 2 CO₂ + 6 H₂O

C atoms - reactants = 4; products = 4

H atoms - reactants = 12; products = 12

O atoms - reactants = 10; products = 10

C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O

C atoms - reactants = 3; products = 3

H atoms - reactants = 8; products = 8

O atoms - reactants = 10; products = 10

2 C₅H₁₂ + 11 O₂ ---> 10 CO₂ + 12 H₂O

C atoms - reactants = 10; products = 10

H atoms - reactants = 24; products = 24

O atoms - reactants = 22; products = 22

The balance equation of combustion reaction for the complete combustion of each molecule C₉H₁₆, C₁₀H₂₀, and C₈H₂₀.

C₉H₁₆ + 13 O₂ ---> 9 CO₂+ 8 H₂O

C₁₀H₂₀ + 15 O₂ ---> 10 CO₂ + 10 H₂O

C₈H₂₀ + 13 O₂ ---> 8 CO₂ + 10 H₂O

A combustion reaction is a chemical reaction in which a substance reacts with oxygen resulting in the release of energy.

Hydrocarbons are compounds composed of only hydrogen and carbon.

They undergo combustion reactions to release heat energy, carbon dioxide, and water.

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The rock layers show that an earthquake occurred and formed a fault through sedimentary rocks. That is option C.

A sedimentary rock is defined as the type of rock that are formed from deposits of dead organic materials that accumulates over a long period of time.

A fault has the ability to develop through the layers of the sedimentary rock when earthquake occurs and this causes the layers of the rock to move relative to each other.

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Neon, argon, krypton, xenon, helium, and radon are examples of noble gases. Due to their monatomic nature and general chemical inertness, these gases are referred to as inert gases.

Under typical circumstances, the noble gases are inert, tasteless, odorless, and nonflammable. In the past, they were referred to as belonging to group 0 in the periodic table since it was thought that they had a valence of zero, which meant that their atoms couldn't interact with those of other elements to form compounds.

The elements in Group 18 of the periodic table are known as noble gases, also referred to as inert gases. They are made up of radioactive radon, which lacks any known stable isotopes, as well as helium, neon, argon, krypton, and xenon. Because they hardly ever bind with less-than-stellar elements—those with open outer electron shells—this is why they are known as "noble" gases.

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