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Periods

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Question

Write down the characteristics and period number of an element having group number 17.

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Solution

Characteristics:
1. It is called as halogen
2. It belongs to group number 17
3.Number of valence electrons are 7.
4. It is a non metal
5.The electronic configuration is:
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$
The period number is 3.

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