Question

Electronic configuration of an element is 2 1s 2 2s 6 2p 1 3s . In modern periodic

table this element belongs to

(A) 1st period

(B) 2nd period

(C) 3rd period

(D) 6th period.​

Answer 1

Answer:-

3ird period

Explanation;-

Summing up the electrons you get 11 electrons.

Sodium has 11 electrons.

Sodium is the third period.

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