Question

Among the following groups which represents the collection of isoelectronic species ?
(1) NO+, C2 2â, O2 â, CO
(2) N2, C2 2â, CO, NO
(3) CO, NO+, CNâ, C2 2â
(4) NO, CNâ, N2, O2

Answer 1

Among the following groups which represents the collection of isoelectronic species ?
(1) NO+, C2 2â, O2 â, CO
(2) N2, C2 2â, CO, NO
(3) CO, NO+, CNâ, C2 2â
(4) NO, CNâ, N2, O2

3 is the answer.........

CO, NO+, CNâ, C2 2â

Answer 2

answer : option (3)

explanation : isoelectronic species means number of electrons in species are same .

$NO^+$ => 7 + 8 -1 = 14 electrons
$C_2^{2-}$ => 6 + 6 + 2 = 14 electrons
$O_2^{2-}$ => 8 + 8 + 2 = 18 electrons
$CO$ => 6 + 8 = 14 electrons
$N_2$ => 7 + 7 = 14 electrons
$CN^-$ => 6 + 7 + 1 = 14 electrons

now you easily understand , which collection is taken.

if we take option (3) $CO,NO^+,CN^-,C_2^{2-}$
all species having 14 electrons is a group of isoelectronic .

hence, option (3) is correct