Question

Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the chloride ion, Cl^-.

Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the calcium ion, Ca²⁺.

A monatomic ion with a charge of +2 has an electronic configuration of 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶.

What is the chemical symbol of the noble gas this ion is isoelectronic with?

Answer 1

Isoelectronic species are the species which are having the same number of electrons.

The species isoelectronic with chloride ion having 18 electrons are:  

1) Ca(+2) which is having 18 electrons.

2) Potassium, K(+1) which is having 18 electrons.

3) Argon, Ar which is having 18 electrons.

4) Sulfur, S(-2) which is having 18 electrons.

The species isoelectronic with Ca2+ which is having 18 electrons are:

1) Sulfur, S(2-) which is having 18 electrons.

2) Chlorine,Cl (1-) which is having 18 electrons.

3) Argon,Ar which is having 18 electrons.

4) Potassium, K (+1) which is having 18 electrons.

The chemical symbol of an atom the electronic configuration same as the atom given is Xenon, Xe which is having 54 electrons.