Question

please answer the attachment​

Answer 1

Answer:

## atomic no. 18

atomic mass.40

element .argon

electronic configuration. k2 L8 M8

valency .0 (the total no. of element present in outermost shell of the atom is 8 , and if the element present in outermost layer is greater than 4 so we will subtract the no. from 8 ,so 8-8 = 0 )

## atomic no.9

atomic mass.18

element. fluorine

electronic configuration. k2 L7

valency = 1 (so 8-7 = 1 )

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