Question

Which neutral atom is isoelectronic with each of the following ions: Ga3+, Ca2+, Mn7+, K+, Sn4+?

Answer 1

1)

Ga has atomic number of 31

Due to +3 charge, it has 28 electrons

28 is atomic number of Ni

So, Ga3+ is isoelectronic with Ni

Answer: Ni

2)

Ca has atomic number of 20

Due to +2 charge, it has 18 electrons

18 is atomic number of Ar

So, Ca2+ is isoelectronic with Ar

Answer: Ar

3)

Mn has atomic number of 25

Due to +7 charge, it has 18 electrons

18 is atomic number of Ar

So, Mn7+ is isoelectronic with Ar

Answer: Ar

4)

K has atomic number of 19

Due to +1 charge, it has 18 electrons

18 is atomic number of Ar

So, K+ is isoelectronic with Ar

Answer: Ar

5)

Sn has atomic number of 50

Due to +4 charge, it has 46 electrons

46 is atomic number of Pd

So, Sn4+ is isoelectronic with Pd

Answer: Pd