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Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

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Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

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Element is chlorine and its atomic number is 17. Electronic configuration = 2,8,7

n = 3

The value of n is 3 which shows third period and there are 7 outer-most electrons which shows 17th group.

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