Question

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Answer 1

sodium (Na) - atomic number=11

k shell = 2 , L shell=8 ,. M shell = 1

valency =1

Phosphorus (P) atomic number 15

K shell = 2 , Lshell = 8 , M shell = 5

valency = 8-5=3

Oxygen (O) atomic number 8

K shell=2, Lshell=6

valency= 8-6=2

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