Question

2. Three elements 'X', 'Y' and 'Z' have
atomic numbers 15, 16 and 17
respectively
a) State their position in the Modern
Periodic table
b) Arrange these elements in the
decreasing order of their atomic radi
c) Write formula of the compound
formed when 'X' combines with 'Z'.​

Answer 1

Answer:

Hope this answers helps

Explanation:

The electronic configuration of the elements X, Y and Z can be written as: X-2,5 Y-2,6 Z-2,7 (a) Since all the elements consists two valence shells, therefore all will belong to period 2nd Group to which X belongs = 10+5 = 15 Group to which Y belongs = 10 +6 = 16 Group to which Z belongs = 10+7 = 17 (b) The elements can be arranged according to the decreasing order of atomic radii as follows: X>Y>Z.

This is because size of the atom decreases when moving from left to right in a period.

(c) When X combines with Z

Valency of X=3

Valency of Z =1

Cross multiplying the valences

The compound formed is XZ3.