Question

20. Match the atomic number 19, 15, 8, 4 and 2 with each of the following:
(i) A metal of valency one.
(ii) A solid non-metal of period 3.
(iii) A rare gas.
(iv) A gaseous element with valency 2.
(v) An element of group 2.
(2017)​

Answer 1

Answer:

1)19-belongs to 1A

2)15-Phosphurus

3)2-Helium as it's a inert gas

4)8-oxygen

5)4-belongs to 2A (Be)

Answer 2

Answer:

19-i) ,15-ii), 8-iv), 4-v), 2-iii)