Chemistry, asked by roopa7revz, 7 months ago

if an atom has atomic number 20 and mass number 40.the number of valence electron possess it

Answers

Answered by aleenajose2002

0

Answer:

2

Explanation:

No of electrons =20

K. L. M. N

2. 8 8. 2

So no of valence electrons is 2

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