Question

Group the specie that are isoelectronic Be²+, F, Fe²+, N³+, He, S², Co³+, Ar?

Answer 1

Heya...

Let us first list down the number of electrons in each species.

WORKING FORMULA

Number of electron in a species = Atomic number - charge.

Hence,

Be²+ = 2

F = 9

Fe²+ = 24

N³+ = 4

He = 2

S²- = 18

Co3+ = 24

Ar= 18.

Hence, groups of isoelectronic species are

1. Be²+ , He
2. Fe²+ , Co³+
3. S²- , Ar.

Regards

Kshitij