Question

An atom of an element 2 has 22 neutrons and 18 protons in its nucleus.What are the (1)Mass number (2) Valence electron and (3)Group no. of Z.​

Answer 1

Explanation:

Mass number =40

Valence electron=0

Group number =3

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Answer 2

Answer:

mass number=39.9 approx 40

valance electron=8

group number = 18