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Question

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

A
I only
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B
II only
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C
I and II only
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D
I and III only
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E
I,II and III
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Solution

The correct option is C I and II only
The atomic no. of Co is 27. its electronic configuration is [AR] 3d7 4s2. So, it has partially filled 3d orbitals and presence of unpaired e s are there.

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