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The ground st...

Question

The ground state electron configuration of the cobalt atom is characterized by which of the following?
$I$ . Partially filled $3 d$ orbitals
$I I$ . The presence of unpaired electrons
$I I I$ . All electrons paired

I

only

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I I

only

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I

and

I I

only

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I

and

I I I

only

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I, I I

and

I I I

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Solution

The correct option is C $I$ and $I I$ only
The atomic no. of Co is 27. its electronic configuration is [AR] 3d $^{7}$ 4s $^{2}$ . So, it has partially filled 3d orbitals and presence of unpaired e $^{-}$ s are there.

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