Question

Calculate atomic number and atomic mass number of an atom containing 20 electrons and 20 neutrons.​

Answer 1

Atomic Number = No. of electron or proton = 20

Atomic mass = No. of epectron or proton + No. of neutron = 40

Atomic configuration according to K L M N 2, 8, 8, 2

and according to s p d f Ar 4s^2

Valency = 2

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