Question

how to find valency with question​

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.

Answer 2

We can find the valency by the help of valence electrons

For eg

Mg Atomic no: 12

Electronic configuration : 2,8,2

The valency is as it's electron in the last shell is 2