Question

Element X has the electronic structure 2,8,5. Element Y has the electronic structure 2,8,7.
What is the likely formula of a compound containing only X and Y?
A XY3 B X2 Y3 C X 3Y D X 3Y2

Answer 1

Answer:

From the given electronic structure element X is Phosphorus which can accommodate 3 monovalent atom (valency). and element Y is chlorine.

so the compound will be PCl3 where each chlorine will take part to fullfill the octate of Phosphorus.

so answer is XY3 (A)