Question

Why 3 rd period contains 8 elemts in periodic table?

Answer 1

Explanation:

According to the 2n2 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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Answer 2

Answer:

Yes.

Explanation:

According to Aufbau's principle,there can be only 8 elements.

Also the s orbital of the fourth shell sits at a lower energy level.

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