First slide

Quantum mechanical model of the atom

Question

Select the correct configuration(s) of the given species If Aufbau rule is not followed

Moderate

A

$M^{2 +} : (electrons = 24) : [Ar] 4 s^{1} 3 d^{5}$
B

$M (electrons = 24) : [Ar] 4 s^{1} 3 d^{5}$
C

$M^{+} (electrons = 24) : [Ar] 4 s^{1} 3 d^{5}$
D

$M (electrons = 19) : [Ar] 3 d^{1}$

Solution

$\begin{aligned} M^{2 +} (electrons = 24, Z = 26) \\ Thus, EC of M = [Ar] 4 s^{2} 3 d^{6} \end{aligned}$
In the formation of M²⁺, electrons are taken out from valence shell (4s). Thus, M²⁺ has EC is [Ar] 3d⁶ : Incorrect
(2) M (electrons = 24, Z = 24)
This represents Cr.
Thus [Ar] 3d⁵4s¹ : Correct
(3) $\begin{array}{l} M^{+} (electrons = 24, Z = 25) \\ M : [Ar] 4 s^{2} 3 d^{5} \\ M^{+} = [Ar] 4 s^{1} 3 d^{5} : Correct \end{array}$
(4) If Aufbau rule is not followed, electrons are filled in available.

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