Question

The pair of Ions having same electronic configuration is
(a) Cr3+ and Fe3+. (b) Fe3+ and Mn2+ (c) Fe3+ and Ni2+. (d) Sc3+ and Cr3+
Give proper explanation for all the parts​

Answer 1

Answer:

fe3+ and mn2 because they have same number of electrons so they will loose it to form complete octet

Answer 2

Explanation:

the electronic configuration of Fe = [Ar]18 3d6 4s2

Fe3+ = [Ar]18 3d5 4s0

the electronic configuration of Mn = [Ar]18 3d5 4s2

Mn2+ = [Ar]18 3d5 4s0

the electronic configuration of Co = [Ar]18 3d7 4s2

Co3+ = [Ar]18 3d6 4s2

the electronic configuration of Sc = [Ar]18 3d1 4s2

Sc3+ = [Ar]18 3d0 4s0 [noble gas configuration]

hence,, option B is correct i.e.,Fe3+ = Mn2+ = [Ar]18 3d5 4s0