Elements X and Y have electronic configurations 1s22s22p6 and 1s22s22p63s23p1 respectively. When they combine, the formula of the compound formed is

Assessment: JAMB UTME - Chemistry - 1989 Subject: Chemistry

Question 1 Report

XY

YX

X2Y3

Y2X3

Answer Details

$\frac{Element X}{1 s^{2} 2 s^{2} 1 p^{4}}$

Valency of X is 2

$\frac{Element Y}{1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 P^{1}}$

valency of Y is 3

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

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