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Three elements $A, B$ and $C$ have $3, 4$ and $2$ electrons respectively present in their outermost shell. From which of the following groups do they belong to?

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14, 2, 4

13, 13, 17

2, 4, 17

13, 14, 2

answer is C.

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Detailed Solution

The elements

A, B

and

C

belong to

13, 14, 2

groups.
Element

A

has

3

valence electrons. So it belongs to group

13 (10 + 3)

. It could be

Al, Ga, B, In or Tl

. Element

B

has

4

valence electrons and belongs to group

14 (10 + 4)

. It could be

C, Si, Ge, Sn or Pb

. Element

C

has a valency of

2

, and therefore it is present in group

2

. It could be

Be, Mg, Ca, Sr, Ba or Ra

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Three elements A, B and C have 3, 4 and 2 electrons respectively present in their outermost shell. From which of the following groups do they belong to?

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Three elements $A, B$ and $C$ have $3, 4$ and $2$ electrons respectively present in their outermost shell. From which of the following groups do they belong to?