Discussion
The atomic number of A is 13 and the atomic number of B is 17. The chemical formula of the compound formed from A and B could be :
Answer: B
The formula is AB3.
Element A (atomic number 13) is aluminium, with configuration 2, 8, 3: it loses 3 electrons to form \(A^{3+}\). Element B (atomic number 17) is chlorine, 2, 8, 7: it gains one electron to form \(B^{-}\). Balancing the charges needs three B ions for each A ion:
\[ A^{3+} + 3B^{-} \rightarrow AB_3 \]
This is aluminium chloride, AlCl3. A3B reverses the ratio, AB2 would need a 2+ ion, and AB a 1+ ion.
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