An atom of element ‘X’ has 4 protons and 5 neutrons with electronic configuration 2, 2. Find its valency.

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Solution

Valency: It is defined as the combining capacity of an element with other elements in order to complete its octet and to achieve a stable noble gas configuration.
The electronic configuration of the atom of element ‘X’ is 2, 2.
It has 2 electrons in its outermost or the valence shell.
It can donate its 2 electrons to achieve a stable noble gas configuration. Therefore, the valency of element ‘X’ is +2.

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