Given below is a set of certain elements out of which one does not belong to the set. Identify the element and state why.
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine

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Solution

Chlorine does not belong to the set (Oxygen, Nitrogen, Carbon, Chlorine, Fluorine).

This is because all other elements belong to the 2^nd period whereas chlorine belongs to the 3^rd period.

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