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Symbols of certain elements are given write down the electronic configuration and find the period and group

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Symbols of certain elements are given write down the electronic configuration and find the period and group in which they are included.

(a)  2311Na

(b) 3517Cl

(c)  199F

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(a)  2311Na

Electron configuration 2, 8, 1

Period – 3

Group – 1

(b) 3517Cl

Electron configuration -2, 8, 7 

Period – 3 

Group-17

(c)  199F

Electron configuration -2, 7

Period – 3 

Group – 17

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