Question

Derive the valency of the element with number of neutrons = 22 and ,
atomic mass = 40 u

Answer 1

Atomic mass is 40 u
No.of neutrons =22
Atomic number = Atomic mass – no.of neutrons
Atomic number=40-22=18
Element is Argon(Ar).

Argon is an inert gas.It's valency is 0

Answer 2

Hi friend ,

Atomic mass = No. of protons + No. of neutrons

40u = No. of protons + 22

40-22 = No. of protons

18 = No. of protons

No. of protons = Atomic no.

Atomic no. = 18

Electronic configuration = 2,8,8

The valency of the element is 0. Because it has valence electrons as 8(octet).

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