Answers

2016-03-10T19:39:07+05:30
Atomicity is the no. of atoms in molecules of an element.The role which it plays is that elements are listed in periodic table of increasing atomic number.
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2016-03-10T19:50:12+05:30
The number of atoms in the molecules of an element like Monoatomic molecules Neon. While Diatomic molecules Hydrogen. And a Tri-atomic molecule is ozone. A tetra-atomic molecule is Phosphorus.and etc

there is no role of atomicity in periodic table
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