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:
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.
Rate this question :