Question

What is the number of electrons in the valence shell of chlorine $\left(\mathrm{Z}=17\right)?$

Answer 1

Valance shell:

1. The outermost electron shell of an atom is called the valence shell or valence orbit.
2. The electrons present in the outermost shell of an atom are called valence electrons.
3. Only these electrons take part in bond formation.

Electrons in the valence shell of chlorine:

1. The atomic number of Chlorine is equal to the number of electrons in the neutral atom $=17$
2. The electronic configuration of chlorine is $2,8,7$
3. Therefore, the number of electrons in the valence shell is equal to $7$.