WAEC - Chemistry (2001 - No. 2)
The atom of an element X combines with aluminium (\(^{13}\)AI)?
AIX 2
AI 2X
AI2X 2
AI 2X 3
Paliwanag
Even though we were not told if the element X were a monoatomic or diatomic, inasmuch as Aluminium has a valency of +3, and there is going to be an exchange of valency between the two atoms of elements combining, X will definitely take the 3 from Al, and from the options, only option D has X having 3. Consequently, the correct option is D.