Looking for classes? Ksquare Career Institute, Bengaluru →
Which one of the following represents all isoelectronic species?
A
$Na^+,Cl^-,O^-,NO^+$
B
$N_2O,N_2O_4,NO^+,NO$
C
$Na^+,Mg^{2+},O^-,F^-$
D
$Ca^{2+},Ar,K^+,Cl^-$
Detailed Solution
Isoelectronic species have the same total number of electrons. $Ca^{2+}$ (18), $Ar$ (18), $K^+$ (18), $Cl^-$ (18) — all have exactly 20... (checking: $Ca$ has 20 electrons, $Ca^{2+}$ has 18; $Ar$ has 18; $K$ has 19, $K^+$ has 18; $Cl$ has 17, $Cl^-$ has 18) — all four species have 18 electrons, making them isoelectronic.