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  4. An atom of an element A has three electrons in its outer shell and B has six electrons in outermost shell. The formula of the compound formed between these two will be

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Q. An atom of an element $A$ has three electrons in its outer shell and $B$ has six electrons in outermost shell. The formula of the compound formed between these two will be

Chemical Bonding and Molecular Structure

Solution:

In this case the valence electrons in the atom $A$ is three and hence its valency is generally $3$. In the atom $B$ the number of valence electrons is six. Hence its valency is usually $2$. Hence the formula of the molecule formed from $A$ and $B$ could be $A_2 B_2$ . An example of two such elements are $Al$ and $O$ and the formula of Aluminium oxide is $Al_2O_3$.