Ncert Exercises & Solutions

Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
$(a) {Co}^{2 +} (b) {Cr}^{2 +} (c) {Mn}^{2 +} (d) {Cr}^{3 +}$

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Electronic configuration of

C o^{2 +} = (A r) 3 d^{7}

; Number of unpaired electrons = 3

Electronic configuration of

C r^{2 +} = (A r) 3 d^{4}

; Number of unpaired electrons = 4

Electronic configuration of

M n^{2 +} = (A r) 3 d^{5}

; Number of unpaired electrons = 5

Electronic configuration of

C r^{3 +} = (A r) 3 d^{3}

; Number of unpaired electrons = 3

Hence, it is clearly seen that both have same number of unpaired electrons, i.e, 3.

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