Question

What is the difference between valency and atomicity??

Answer 1

Atomicity: the number of atoms constituting a molecule represent its atomicity
Valency : the combining power (or capacity) of an element is called its valency

Answer 2

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Atomicity:-

Atomicity is the total number of atoms present in one molecule of an element or a substance.
In Simple Words
Atomicity is the number of atoms constituting a molecule like for eg P4,O3
Valency:-

The combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.
In Simple words
valency is the combining capacity of a element or it is a loss , gain or share of electron for eg:
"carbon always has a valency of 4"