Monatomic Gases

What are Monatomic Gases?

“Monatomic” is a combination of two words “mono”, and “atomic” means a single atom. This term is used in both Physics and Chemistry and is applied to the gases as monatomic gases. In the gaseous phase at sufficiently high temperatures, all the chemical elements are monatomic gases.

Noble gases are monatomic gases as they are unreactive, which is a property of these gases. They do find applications in daily life like

• Helium is used in filling balloons as their density is lower than the air’s.
• Neon is used for creating advertising signs as they glow when electricity flows through them.
• Argon is used in a light bulb to prevent the burning of the filament as it is unreactive.

What are Diatomic Molecules?

Diatomic molecules are those molecules that are composed of only two atoms. If a diatomic molecule is composed of the same element, it is known as a homonuclear, and if it is composed of two different elements, it is known as heteronuclear.

What is a Polyatomic Ion?

A polyatomic ion is also known as a molecular ion that is composed of two or more covalently bonded atoms. It is also referred to as a radical.

Monatomic Examples

The noble gases are examples of monatomic gases, and they are:

• Helium
• Radon
• Neon
• Xenon
• Argon
• Krypton

Diatomic Molecules Example

Diatomic elements are non-metals and exist in pure form as:

Hydrogen H2

Nitrogen N2

Fluorine F2

Oxygen O2

Iodine I2

Chlorine Cl2

Bromine Br2

Examples of Polyatomic Ions

Following is the common list of polyatomic ions:

Anions	Cations
Chlorite \(\begin{array}{l}ClO_{2}^{-}\end{array} \)	Mercury \(\begin{array}{l}Hg_{2}^{2+}\end{array} \)
Nitrite \(\begin{array}{l}NO_{2}^{-}\end{array} \)	Ammonium \(\begin{array}{l}NH_{4}^{+}\end{array} \)
Peroxide \(\begin{array}{l}O_{2}^{2-}\end{array} \)	Hydronium H3O+
Bicarbonate \(\begin{array}{l}HCO_{3}^{-}\end{array} \)	Fluoronium H2F+
Bisulfate \(\begin{array}{l}HSO_{4}^{-}\end{array} \)	Phosphonium \(\begin{array}{l}PH_{4}^{+}\end{array} \)

Related Physics Articles:

Thermodynamics

Law Of Equipartition Of Energy

Kinetic Energy

Boyle’s Law describes the pressure and volume of an ideal gas. Watch the video and learn more about this gas law.

Frequently Asked Questions – FAQs

Q1

What are the 7 monatomic elements?

He, Ne, Ar, Kr, Xe, Rn and Og.

Q2

What is difference between monatomic and diatomic?

Monatomic compounds are made of a single atom, whereas diatomic compounds are made of molecules with two atoms. This is the primary distinction between monatomic and diatomic compounds.

Q3

What is meaning of monatomic?

Containing a single atom

Q4

Exactly how monatomic are noble gases?

All noble gases are monatomic.

Q5

What is triatomic gas?

Triatomic molecules—those with atomicity of three—are those of these gases and have three atoms in each.

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