Which elements/ions have same number of unpaired electrons? (1) Fe 3+ (2) Cr (3) Cu + (4) V

Question

Which elements/ions have same number of unpaired electrons? (1) Fe 3+ (2) Cr (3) Cu + (4) V  (A) 1, 2 and 3 are correct (B) 1 and 2 are correct (C) 2 and 4 are correct (D) 1 and 3 are correct

Tardigrade Admin · Accepted Answer

Fe 3+( Z =26):[ Ar ] 3 d5, 4 s0: 5 unpaired electrons Cr ( Z =24):[ Ar ] 3 d5 4 s1: 5 unpaired electrons

Q. Which elements/ions have same number of unpaired electrons?
(1) $F e^{3 +}$
(2) $C r$
(3) $C u^{+}$
(4) $V$

1, 2 and 3 are correct

1 and 2 are correct

2 and 4 are correct

1 and 3 are correct

$F e^{3 +} (Z = 26) : [A r] 3 d^{5}, 4 s^{0} : 5$ unpaired electrons
$C r (Z = 24) : [A r] 3 d^{5} 4 s^{1} : 5$ unpaired electrons

Q. Which elements/ions have same number of unpaired electrons? (1) Fe3+ (2) Cr (3) Cu+ (4) V