Which one of the following ions has an electronic configuration of $[A r] 3 d^{6}$ ?
$(A t o m i c N u m b e r : M n = 25, F e = 26, C o = 27, N i = 28)$

N i^{3 +}

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M n^{3 +}

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F e^{3 +}

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C o^{3 +}

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Solution

The correct option is D $C o^{3 +}$
Electronic configurations of elements as per the Aufbau Principle:
$N i^{3 +} = [A r] 3 d^{7}$
$M n^{3 +} = [A r] 3 d^{4}$
$F e^{3 +} = [A r] 3 d^{5}$
$C o^{3 +} = [A r] 3 d^{6}$
$C o^{3 +}$ will have the required electronic configuration

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Similar questions

Which one of the following complexes is an outer orbital complex? [Atomic numbers: Mn = 25, Fe = 26, Co = 27, Ni= 28]

Q. Which one of the following complexes is an outer orbital complex?
(Atomic number of

M n = 25, F e = 26, C o = 27, N i = 28

)

Q. The d-electron configurations of

C r^{2 +}, M n^{2 +}, F e^{2 +}

and

C o^{2 +}

are

d^{4}, d^{5}, d^{6}

and

d^{^{7}}

respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?

(Atomic numbers of Cr

= 24, M n = 25, F e = 26, C o = 27)

Atomic number of Mn, Fe, Co and Ni are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?
(a) $[M n C l_{6}]^{3 -}$
(b) $[F e F_{6}]^{3 -}$
(c) $[C o F_{6}]^{- 3 -}$
(d) $[N i (N H_{3})_{6}]^{2 +}$

Q. The d-electron configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}

are

d^{4}

d^{5}

d^{6}

and

d^{7}

respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

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Which one of the following ions has an electronic configuration of [Ar]3d6 ? (Atomic Number: Mn =25,Fe=26,Co = 27,Ni = 28)

The correct option is D Co3+Electronic configurations of elements as per the Aufbau Principle: Ni3+ = [Ar]3d7 Mn3+ = [Ar]3d4 Fe3+ = [Ar]3d5 Co3+ = [Ar]3d6 Co3+ will have the required electronic configuration

Which one of the following ions has an electronic configuration of $[A r] 3 d^{6}$ ?
$(A t o m i c N u m b e r : M n = 25, F e = 26, C o = 27, N i = 28)$

The correct option is D $C o^{3 +}$
Electronic configurations of elements as per the Aufbau Principle:
$N i^{3 +} = [A r] 3 d^{7}$
$M n^{3 +} = [A r] 3 d^{4}$
$F e^{3 +} = [A r] 3 d^{5}$
$C o^{3 +} = [A r] 3 d^{6}$
$C o^{3 +}$ will have the required electronic configuration