An element $X$ lies in the third period and group $17$ . Find out,
the number of valence electrons in its atom

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Solution

The element X is:
The valence electrons are defined as the number of electrons present in the last orbital of an element.
The group number corresponds to the number of valence electron an element will have. If an element belongs to group $I A$ or $I I A$ it will have $1$ or $2$ electrons respectively.
If it belongs to $13, 14, 15, 16, 17, 18$ group it will $3, 4, 5, 6, 7, 8$ valence electrons.
The element belongs to $17$ group will have $7$ valence electrons.

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