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Q.

Which of the following has the highest number of unpaired electrons?

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a

P(Z = 15)

b

Fe(Z = 26)

c

Zn(Z = 30)

d

Cr(Z =24)

answer is D.

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Detailed Solution

P(Z = 15) has 3p3, three unpaired electrons Fe(Z = 26) has 3d6, four unpaired electrons.Zn(Z = 30) has no unpaired electrons.Cr(Z = 24) has 3d5 4s1, six unpaired electrons.
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Which of the following has the highest number of unpaired electrons?