JEE Main · 2024 · Shift-IIeasyDNF-006

Choose the correct option having all the elements with d10 electronic configuration from the following:

d & f-Block Elements · Class 12 · JEE Main Previous Year Question

Question

Choose the correct option having all the elements with $d^{10}$ electronic configuration from the following:

Options

a
${}^{27}\text{Co},\, {}^{28}\text{Ni},\, {}^{26}\text{Fe},\, {}^{24}\text{Cr}$
b
${}^{29}\text{Cu},\, {}^{30}\text{Zn},\, {}^{48}\text{Cd},\, {}^{47}\text{Ag}$
✓
c
${}^{46}\text{Pd},\, {}^{28}\text{Ni},\, {}^{26}\text{Fe},\, {}^{24}\text{Cr}$
d
${}^{28}\text{Ni},\, {}^{24}\text{Cr},\, {}^{26}\text{Fe},\, {}^{29}\text{Cu}$

Correct Answerb

${}^{29}\text{Cu},\, {}^{30}\text{Zn},\, {}^{48}\text{Cd},\, {}^{47}\text{Ag}$

Detailed Solution

Checking Option (2) — all must have $d^{10}$ in ground state:

| Element | Z | Ground State Config | d electrons | |---------|---|---------------------|-------------| | Cu | 29 | [Ar] $3d^{10} 4s^1$ | $3d^{10}$ ✓ | | Zn | 30 | [Ar] $3d^{10} 4s^2$ | $3d^{10}$ ✓ | | Cd | 48 | [Kr] $4d^{10} 5s^2$ | $4d^{10}$ ✓ | | Ag | 47 | [Kr] $4d^{10} 5s^1$ | $4d^{10}$ ✓ |

All four have completely filled $d^{10}$ configuration. ✓

Other options fail: Co ( $3d^7$ ), Ni ( $3d^8$ ), Fe ( $3d^6$ ), Cr ( $3d^5 4s^1$ ) — none are $d^{10}$ .

Answer: Option (2)

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