Question

Which of the following are isoelectronic species i.e., those having the same number of
electrons?
Na+, K+, Mg2+, Ca2+, s2-, Ar
​

Answer 1

You are correct...they are those who have same no of electrons..

here.....Na+,Mg2+...is one group..(10 electrons)

another is.......K+,Ar,S2-,Ca2+.. (18 electrons)

hope it helps....

plz mark as brainliest

Answer 2

Isoelectronic are the species having same number of electrons.

A positive charge means the shortage of an electron.

A negative charge means gain of electron.

Number of electrons in Na+ = 11-1 = 10

Number of electrons in K+ = 19-1 = 18

Number of electrons in Mg2+ = 12-2 = 10

Number of electrons in Ca2+ = 20-2 = 18

Number of electrons in S2- = 16+2 = 18

Number of electrons in Ar = 18

Hence, the following are isoelectronic species:

1) Na+ andMg2+ (10 electrons each)

2) K+, Ca2+, S2- and Ar (18 electrons each