Question

Identify the following on the basis of given atomic numbers:-
19, 15, 14, 8, 4
(i) Gas with valency of 2
(ii) Metal with valency of 1
(iii) Non metal (solid) with valency of 3
(iv) Metalloid with valency of 4

Answer 1

Identification of compounds is as follows-

(i) Gas with valency of 2- Oxygen

Atomic number is 8

(ii) Metal with valency of 1 - Potassium

Atomic number is 19

(iii) Non metal (solid) with valency of 3 - Phosphorus

Atomic number is 15

(iv) Metalloid with valency of 4 - Silicon

Atomic number is 14

Metals are good conductors of electricity.

Non metals do not conduct electricity.

There are some exceptions in case of non metals, which conduct electricity like graphite.

Metalloids conduct electricity only at high temperatures. They are also called semi conductors.