Question

Following are the 4 elements W, X, Y and Z and their atomic numbers are 9, 10, 16, 17 respectively. Predict the following:
(a) Two elements lying in same group.
(b) Elements in second period.

Answer 1

Answer:

(a) elements of atomic no. 9 and 17 lying in same grp i.e. grp of halogens.

(b) elements of atomic no. 9 and 10 are the of 2nd period.