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Question

The formula of a compound between a group 13 element, M, and a group 15 element, X, will be:

A
MX
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B
M3X3
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C
M2X3
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D
MX3
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Solution

The correct option is C MX
The formula of a compound between any group 13 element, M, and any group 15 element, X, will be MX. An example is aluminum nitride AlN. M will lose three electrons to complete its octet. It will form M3+ ion. X will gain three electrons to complete its octet. It will form X3 ion. One M3+ ion will combine with one X3 ion.

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