The atomic number of chromium is 24. Its electronic configuration in ground state is 1s $^{2}$ 2s $^{2}$ 2p $^{6}$ 3s $^{2}$ 3p $^{6}$ 4s $^{1}$ 3d $^{5}$ . Chromium atom by losing 3 electrons form Cr $^{3 +}$ ions. A chromium atom contains 17% more neutron than the protons. Now answer the following questions
The number of unpaired electrons in Cr $^{3 +}$ ions is :

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Solution

The correct option is A 3
From electronic configuration, it can be seen that
1s $^{2}$ , 2s $^{2}$ 2p $^{6}$ 3s $^{2}$ 3p $^{6}$ 4s $^{0}$ 3d $^{3}$ .
Three electrons in 3d sub-shell are unpaired

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