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# Atomicity of phosphorus is:(a) one(b) two(c) three(d) four

Last updated date: 13th Aug 2024
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Hint: Atomicity is defined as the total number of atoms that constitute a molecule. In olden days atomicity was used in the same sense as valency. There are different types of atomicity.

Atomicity of an element is a measure of total number of atoms present in a molecule. Example, an oxygen molecule contains two oxygen atoms. Therefore, the atomicity of oxygen is 2. In case of ozone, the atomicity is 3.
We can determine the atomicity of any element. It is determined by the ratio of molecular mass of total number of atoms to atomic mass of an element.
For phosphorus,
Molecular mass = 120
Atomic mass = 30
Therefore, $Atomicity=\dfrac{120}{30}=4$

Thus the correct answer for the question is (d).

iii) Diphosphorus has a chemical formula ${{P}_{2}}$. The atomicity of this phosphorus is 2. Diphosphorus is obtained by heating white phosphorus of tetraphosphorus ${{P}_{4}}$ (atomicity of phosphorus in this is 4) at 1100K. ${{P}_{4}}$.