Question

State the method of determining the valency of an element if its atomic number is given

Answer 1

It is determined by Electronic Configuration.
EC=2n²
Suppose if we have to find the valency of Neon.
At. no.=10
EC=2,8
then valency is 0.
Sodium at. no.=11
EC=2,8,1.
valency is 1.
If outer orbit's electron is more than 4,subtract it with 8.
If less then 4,that's the valency.

Answer 2

Answer:

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Explanation:

The number of electrons gained, lost or shared to make the octet of electrons (in the outermost shell), gives us directly the combining capacity of the element, that is, the valency