First slide

Characteristics of transition elements

Question

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
$Column - I Column - II A . {Co}^{3 +} (i) \sqrt{8} B . M B . {Cr}^{3 +} (ii) \sqrt{35} B . M . C . {Fe}^{3 +} (iii) \sqrt{3} B . M . D . {Ni}^{2 +} (iv) \sqrt{24} B . M . (v) \sqrt{15} B . M .$

Moderate

Solution

${Co}^{3 +} = [Ar] 3 d^{6}, unpaired e^{-} (n) = 4$
$Spin magnetic moment (μ)= \sqrt{4 (4 + 2)} = \sqrt{24} B \cdot M {Cr}^{3 +} = [Ar] 3 d^{3}, unpaired e^{-} (n) = 3 Spin magnetic moment (μ) = \sqrt{3 (3 + 2)} = \sqrt{15} B . M {Fe}^{3 +} = [Ar] 3 d^{5}, unpaired e^{-} (n) = 5 Spin magnetic moment (μ) = \sqrt{5 (5 + 2)} = \sqrt{35} B \cdot M {Ni}^{2 +} = [Ar] 3 d^{8}, unpaired e^{-} (n) = 2 Spin magnetic moment (μ) = \sqrt{2 (2 + 2)} = \sqrt{8} B \cdot M$

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