Question

How do we calculate the valency of an element from its electronic configuration ?

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Answer 1

Explanation:

An element's valency is determined by the number of electrons in its outer shell. Hence, the number of valence electrons obtained from the electronic configuration of the element gives the valency i.e. the number of electrons lost, gained or shared by the element to attain the noble gas configuration.example of sodium

1s2 2s2 2p6 3s1

in case of sodium valency is 1

Answer 2

Answer:

By looking at there requirements

Explanation:

Valency means the no. of electrons the element needs or want to leave

An electron can't take or lose more than 3 electron

Means how much electron it will give to another atom or how much electron it will take from another atom is its valency.

Hope you could understand