An atom X has three Valence Electrons and atom Y has 6 Valence Electrons. What is the formula of the compound formed between them?

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Solution

A2B3 is the answer.

In a neutral (uncharged) molecule, the sum of the bonding valence electrons must be equal. So, the products of the negative element and its charge and the positive element and its charge must be equal.
C1×N1=C2×N2

If we have a 3 valence electrons, the "A" charge will be either +3 or -5 for a full octet, and 6 valence electrons in "B" atoms will most likely result in acquisition of additional electrons (2) for an octet and relative charge of -2. Thus, "A" will be the positive ion, at +3.

Balancing the two:

3×A= 2×B

To be equal,

A=2 and B=3

A2B3

Hope this helps.

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