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Elements X and Y have electronic configurations 1s22...

Elements X and Y have electronic configurations 1s22s22p4 and 1s22s22p23s63p1 respectively. When they combine, the formula of the compound formed is?

A.

XY

B.

YX

C.

X2Y3

D.

Y2X3

Correct answer is D

Element X1s22s21p4

Valency of X is 2


Element Y1s22s22p63s23P1

valency of Y is 3

There is an exchange of valency when a compound is being formed. Hence, we have Y2X3