Question

For an element, Z = 9. The valency of this element will be :

विकल्प

• 4

• 2

• 1

• 3

Answer 1

1
Atomic number is 9, which means that number of electrons is also 9. Electronic configuration is 2 , 7. So, the atom will gain 1 electron to complete its octet. Therefore, the valency is 1.