Question

What is the atomicity of argon?

Answer 1

The total number of atoms that make up a molecule is known as atomicity. Simply defined, it refers to the number of atoms in a molecule. Each molecule of oxygen, for example, is made up of two oxygen atoms. As a result, the atomicity of oxygen is 2. Atomicity is frequently confused with valency in older settings.

Complete Step By Step Answer:
The number of atoms in a molecule is referred to as atomicity. In most situations, atomicity is employed to describe a specific element's molecular form. This indicates that the molecule has only one ingredient. The atomicity of an element is determined by the number of atoms it contains.
The elements in group-18 of the periodic table are known as noble gases. They are given the label noble gas since they do not react with other elements. Because of their electrical structure, they are not reactive.
The general electronic configuration of noble gases can be given as $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}$ . That means that they have complete octet configuration in their valence shell. This gives them very high stability.
Due to this high stability, the noble gas atoms do not combine with other atoms. So, they do not form bonds with any other atoms and hence they are always monoatomic.
Monatomic gas is a gas which has only one atom in the structure.
Thus, we can say that all the noble gases are monatomic.

Note:
All the noble gases are monatomic. The examples include He (Helium), Ne (Neon), Ar (Argon), Xe (Xenon), Ra (Radon). Different allotropes of the same element might have different atomic cities. Any element's atomicity may be determined in a straightforward manner. It may be calculated as a molecular mass to atomic mass ratio. The molecular mass of an oxygen molecule, for example, is 32, while the atomic mass is 16. We obtain atomicity as 2 when we split the two.