Question

why 2nd period contain only 8 elements.
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Answer 1

Answer:

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Explanation:

The elements are ordered into periods based on which electron shells are being filled (from left to right). ... In the second period, the second shell is being filled. And so on. There are 8 elements in period 2 because all those elements have electrons in the second shell and no electrons in the third shell.

Answer 2

Answer:

The elements are ordered into periods based on which electron shells are being filled (from left to right). ... In the second period, the second shell is being filled. And so on. There are 8 elements in period 2 because all those elements have electrons in the second shell and no electrons in the third shell

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