Question

how we can calculate the valency urgent ​

Answer 1

Answer:

If the number of electrons in the outer shell is between one to four, the compound is said to have positive valency. For compounds with electrons four, five, six, or seven, the valency is determined by subtracting the electron from eight. All noble gases except for Helium have eight electrons.

Explanation:

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Answer 2

Answer:

we can calculate the valency by the furmula 2n^2

where n=1,2,3,4

for first shell=2×1^2

=2

FOR 2nd shell=2n^2

=2×2^2

=2×4

=8

Explanation:

now valency of sodium= symbol is na

atomic no.=11

valency=2,8,1