Q. 94.3( 7 Votes )

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Answer :

Since the electrons in the atoms of four elements A, B, C and D are distributed in three shells which are having 1, 3, 5 and 7 electrons in the outermost shell. So, the electronic configuration of elements A, B, C and D is as follows:

A: 2, 8, 1

B: 2, 8, 3

C: 2, 8, 5

D: 2, 8, 7

Since all the elements have three sub-shells, so they belong to 3rd period.

We need to find the valency of element A and D, to find the molecular formula of the compound

Since, element A has 1 valence electron, therefore valency of A is 1. Also, Element D has 7 valence electrons, so valency of D is 1.

Cross multiplying the valences of element A and element D:

Therefore, the compound formed is: AD

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