Question

B)Match the following
Column
Column II
(1) Noble gas
(a) 18 elements
(2) First period
(b) Eight elements
(3) Second period
(c)Two elements
(4) Third Period
(d) Helium​

Answer 1

Answer:

1) Noble gas = Helium

2)First period= 18 elements

3) Second period= 2 elements

4) Third period= Eight elements