Question

explain why the number of elements in the third period is 8?
(note:just need 1 line answer)​

Answer 1

Answer:

According to the 2n square rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

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