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Bohr's Model of an Atom

The number of...

Question

The number of unpaired electrons in the complex ion $[C o F_{6}]^{3 -}$ is (atomic no. $C o = 27)$ :

A

0

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B

2

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C

3

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D

4

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Solution

The correct option is D 4
Co(Z=27) has observed electronic configuration [Ar] $3 d^{7} 4 s^{2}$ . $C o^{3 +}$ has electronic configuration [Ar] $3 d^{6} 4 s^{0}$ . $[C o F_{6}]^{3 -}$ is a high spin complex and contains 4 unpaired electrons.

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