Atomic Numbers Three Elements And17 Respectively State Which Elements Chemical Properties

The atomic numbers of three elements X, Y and Z are 3, 11 and17 respectively. State which elements will show same chemical properties.

Answers:

the electronic configuration are as follows:

 X 2,1

Y: 2,8,1

Z: 2, 8,7

Since X and Y have same no. of valence electrons, so X and Y will have same chemical properties.