Science, asked by chingkheisanasoram, 9 months ago

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.

Answers

Answered by jennie02

7

Explanation:

Mass number =40

Valence electron=0

Group number =3

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Answered by paxxst009

4

Answer:

mass number=39.9 approx 40

valance electron=8

group number = 18

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