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An element has [Ar]3d' configuration in ...

An element has `[Ar]3d`' configuration in its `+2` oxidation state. Its position in the periodic table is

A

period -3, group -3

B

period-3,group -7

C

period-4,group-3

D

period-3,group-9

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The correct Answer is:
C
Element electronic configuration in `+2` oxidation sate is `[Ar]3d^(1)=78+1+2=21`
The elements is scandium it belongs to 4th period nad 3rd group.
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