Question

Which one of the following groupings
represents a collection of isoelectronic species
? (At. nos. Os : 55, Br : 35).
(a) N3-, F-, Nat (b) Be, Al3+, Cl-
(c) Ca2+, Cst, Br (d) Na+, Ca2+, Mg2+​

Answer 1

Answer:

Option (a) is correct....

Explanation:

First we should know the notations...

▪️+ sign represents that the element has lost electrons...

▪️- sign represents that the element has gained electrons....

Now checking the options....

(a) N has total of 7 electrons..

Now it has 3- charge means it has gained 3 electons...

So its total electrons become 7+3 = 10

F has total of 9 electrons....

Now it has 1- charge means it has gained 1 electron....

So its total electrons become 9+1 = 10

Na has total of 11 electrons....

Now it has 1+ charge means it has lost 1 electron....

So its total electrons become 11-1 = 10

Hence they are the isoelectronic species here....