The number of atoms present in one molecule of an elementary substance is called its :

Atomicity

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valency

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molecular weight

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None of these

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Solution

The correct option is A Atomicity
The number of atoms present in one molecule of an elementary substance is called its atomicity.
For example, the atomicity of HBr is 2 and the atomicity of $P C l_{5}$ is 6.

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The number of atoms present in one molecule of an element is called as:

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