Answers

2016-03-10T19:27:04+05:30
You have to add them all.
for example the atomicity of H₂O is 1x2 + 16=18

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The Brainliest Answer!
2016-03-10T19:37:04+05:30
For example
H2O
Valency of H=1
Valency of O=16
Now,
Add them all
1*2+16= 18

Hope it helps
1 5 1
but why for oxygen is atomicity 2?