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Question

The number of electrons lost, gained or shared by an atom of an element is known as ………………………


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Solution

Electro valency - The number of electrons of an element that take part in a chemical reaction to attain nearest noble gas configuration is known as its valency

For example,

Sodium (N11a) - 2, 8, 1. Sodium donates its outermost electron to attain the configuration of nearest noble gas . So its valency is 1

Oxygen (O8) - 2,6. Oxygen accept two electrons to attain nearest noble gas configuration. So its valency is 2 .

Therefore, the number of electrons lost, gained or shared by an atom of an element is known as electro valency.


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