Element A and 3 electron in the outermost orbit and elements B has 6electron in the outermost orbit. The formula of the compound formed between A and B would be:
A
A2B3
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B
A2B6
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C
A2B
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D
A3B2
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Solution
The correct option is BA2B3
Element A has 3 electrons in outermost shell so its valency is 3. It will loose 3 electrons to attain stability, as loss of 3 electrons is easier than gain of 5 electrons.
Valency of B is −2 as it will gain 2 electrons to attain stability and combine with other atom.