Write down the electronic configuration of

$C r^{3 +}$

$P m^{3 +}$

$C u^{+}$

$C e^{4 +}$

$C o^{2 +}$

$L u^{2 +}$

$M n^{2 +}$

$T h^{4 +}$

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Solution

$_{24} C r = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{5} 4 s^{1}$ or $[A r] 3 d^{5}, 4 s^{1}$
$C r^{3 +} = 1 s^{2}, 2 s^{2} p^{6} d^{3} 3 d^{3}, 4 s^{0}$ or $[A r] 3 d^{3} 4 s^{0}$

$_{61} P m = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{5}, 5 s^{2} p^{6} 6 s^{2}$ or $[X e] 4 f^{5} 6 s^{2}$
$P m^{3 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{4}, 5 s^{2} p^{6}$ or $[X e] 4 f^{4} 6 s^{0}$

$_{29} C u = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10} 4 s^{1}$ or $[A s] 3 d 104 s^{1}$
$C u^{+} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}$ or $[A r] 3 d^{10} 4 s^{0}$

$_{58} C e = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{1}, 5 s^{2} p^{6} d^{1} 6 s^{2}$ or $[X e] 4 f^{1} 5 d^{1} 6 s^{2}$
$C e^{4 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{0}, 5 s^{2} p^{6} d^{0} 6 s^{0}$ or $[X e] 4 f^{0} 5 d^{0} 6 s^{0}$

$_{27} C o = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{7} 4 s^{2}$ or $[A r] 3 d^{7} 4 s^{2}$
$C o^{2 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{7} 4 s^{0}$ or $[A r] 3 d^{7} 4 s^{0}$

$_{71} L u = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{14}, 5 s^{2} p^{6} d^{1} 6 s^{2}$ or $[X e] 4 f^{14} 5 d^{1} 6 s^{2}$
$L u^{2 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10} f^{14}, 5 s^{2} p^{6} d^{1} 6 s^{0}$ or $[X e] 4 f^{14} 5 d^{1} 6 s^{0}$

$_{25} M n = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{5} 4 s^{2}$ or $[A r] 3 d^{5} 4 s^{2}$
$M n^{2 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{5} 4 s^{0}$ or $[A r] 3 d^{5} 4 s^{0}$

$_{90} T h = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{14}, 5 s^{2} p^{6} d^{10}, 6 s^{2} p^{6} d^{2}, 7 s^{2}$ or $[R n] 6 d^{2}, 7 s^{2}$
$T h^{4 +} = 1 s^{2}, 2 s^{2} p^{6}, 3 s^{2} p^{6} d^{10}, 4 s^{2} p^{6} d^{10} f^{14}, 5 s^{2} p^{6} d^{10}, 6 s^{2} p^{6} 6 d^{0}, 7 s^{0}$ or $[R n] 6 d^{0}, 7 s^{0}$

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Question 14

The pair of ions having same electronic configuration is.............

(a) $C r^{3 +}, F e^{3 +}$ (b) $F e^{3 +}, M n^{2 +} +$ (c) $F e^{3 +}, C o^{3 +}$ (d) $S C^{3 +}, C r^{3 +}$

Write down the number of 3d electrons in each of the following ions:

Ti²⁺, V²⁺, Cr³⁺, Mn²⁺, Fe²⁺, Fe³⁺, CO²⁺, Ni²⁺ and Cu²⁺.

Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

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