Question

The atomic numbers of three
elements X,Y,Z are 3,9 and 11.
Which will have same chemical
properties ? Why?​

Answer 1

Answer:

X and Z

Step-by-step explanation:

The chemical properties of elements depend on their electronic configurations.

Electronic configuration of X:

K = 2

L = 1

Electronic configuration of Y:

K = 2

L = 7

Electronic configuration of Z:

K = 2

L = 8

M = 1

Valencies of X and Z are the same, i.e. 1. So they will possess the same properties of alkali metals.