Answers

2015-03-27T22:37:27+05:30
Atomicity is total no of atoms present in a molecule,

Thus atomicity of H2S=3
                          H2SO4=7
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2015-03-28T10:09:03+05:30
The no of atoms present in one molecule of an element is called atomicity.
from that for
H2S =3  [ 2 hydrogen + 1 sulfer]
H2SO4 = 7 [ 2hydrogen + 1 sulfer + 4 oxygen]
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