Q. 104.8( 4 Votes )

Three elements 'X

Answer :

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.


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