Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Their valencies respectively are:

1, 2, 3

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2, 4, 3

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3, 2, 4

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3, 4, 2

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Solution

The correct option is D 3, 4, 2
As 'A' has three electrons in outermost shell, it will be in aluminium group, that is, group thirteen. Whereas for four electrons, it will be in the group next to group thirteen that is, group fourteen and this is silicon group. Finally, we have two electrons which is in group 2, this is magnesium, calcium .

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