Question

Which of the following is an example of a positive
ion and negative ion that is isoelectronic with Argon and why
1) K+ and Cl- or Ca2+ and S2-
2) Na+ and For Mg2+ and O2-
3) K +and I- or Mg2+ and S2-
4) K +and I- or Ca2+ and 02-​

Answer 1

Answer:

1 is the answer

Explanation:

isoelectronic species have same no. of electrons

here,

K+(Atm. No. 19)loses one e-

&

Cl-(Atm. No.17) gain one e-

For completing their octet and to acquire

noble gas configuration which is similar to Argon ( Atomic no. 18)

similarly

Ca2+(Atm. No. 20) loses two e-

and

S2- (Atm. No.16) gain to e-