Atomicity of an element is the number of atoms contained in one molecule of it.
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Why atomic masses are the average values?
Most of the elements exist in diferent isotopes i.e. atoms with different masses e.g. Cl has two isotopes with mass numbers 35 and 37 existing in the ratio 3:1. Hence average value is taken.
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What is Avogadro's number?
The number 6·023×1023 is called Avogadro’s number (NA).
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What is the relation between molecular weight and vapour density?
Relation between molecular weight and vapour density is,