Question

How to find valency and valence electrons
write the valency from 1 to 20 elements with name

Answer 1

Valence electrons means the number of electrons present in the outermost shell.

Valency of group 1 and group 2 elements remain the same . Whereas the valency of group 13 to group 18 elements is (8 - number of valence electrons)

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Answer 2

Explanation:

With the help of atomic no.

ex Sodium atomic no. is 11 so the Valence electron is 2,8,1 .

so last shell having 1 then valency is 1

other example phosphorus atomic no.is 15 then electron is 2,8,5

so, then subtract 8-5 then the valency is 4

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