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What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?

ATOMIC VOLUME:
Atomic Volume of is define as the volume occupied by one mole of atoms or gram atom of the given element in the solid state .
Thus Atomic volume = atomic weight in gram/ Density in solid state 
(A) In general atomic volume generally leads to higher density as vice versa higher atomic volume generally leads to lower density. 
(B) Trends in group:
When we move from top to bottom in a group the atomic volume generally increases.
(C) Trends in period: 
When we move from move left to right along a period the atomic volume first decrease to minimum at mid period then increases.

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