Question

what do you understand by valency electrons? explain.
(for class 9)

Answer 1

Valence electrons is the number of electrons in the outermost shell of an atom.

Answer 2

Q1. What is valency?

ANSWER➡️ The valency of an element is defined as the ability of an atom to loose or gain electrons to attain a noble gas configuration and complete its octet.

Q2.What are valence electrons?

ANSWER➡️ The electrons which are present in the outermost shell of an atom are known as valence electrons.

✍Let us take an example.

Consider Chlorine. It has an atomic number of 17. So if we write its electronic configuration then it comes out to be:-

2, 8, 7

So we can say that it has 7 electrons in its outermost valence shell and has 7 valence electrons. It has a valency of 1 because it has to gain 1 electron to complete its octet.