An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be :
Question
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be :
Solution
The formula of the compound can be determined by understanding how atoms combine to form compounds. Atoms combine in a way that allows them to attain a stable electron configuration. This usually means having a full outermost electron shell.
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Atom A has three electrons in its outermost shell. It needs five more to complete its outer shell (since the outermost shell can hold up to eight electrons).
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Atom B has six electrons in its outermost shell. It needs two more to complete its outer shell.
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Therefore, to achieve a stable electron configuration, one atom of A will combine with two atoms of B.
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Hence, the formula of the compound will be AB2.
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