Question

According to Afbau principal periode n=3 there are 18 elements and according Modern Periodic Table have 8 elements , Tell the reason.​

Answer 1

Answer:

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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

Answer 2

Answer:

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Explanation:

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