Science, asked by preetijagtap17, 6 months ago

which atom belongs to 2nd period and why from the give below
3Li
11Na
4Be
19K​

Answers

Answered by kaviKesri
1

Answer:

Halo

Explanation:

14he, 11ne,15p belong to the third period because according to their electronic configuration each element contains three shell k, l, m, 20ca,4be belong to second group because these elements 2 electrons in it outermost shell.

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