Arrange these species into isoelectronic groups. It does not matter which group goes in which box, so long as the correct species are grouped. Isoelectronic group A Isoelectronic group B Isoelectronic group C Answer Bank

The species to be arranged are;

Sr2+, N3-, Li+, Ne, Br-, B3+, Al3+, He, Y3+

Answer:

Group A (10 electron species)

Al^3+, Ne, N^3-

Group B (36 electron species)

Sr^2+, Y^3+, Br^-

Group C (2 electron species)

He, Li^+, B^3+

Explanation:

Atoms and ions that have the same electron configuration are said to be isoelectronic. The species may not belong to the same group in the periodic table but are connected by the fact that they all have the same number of electrons. Cations and anions may belong to the same group of isoelectronic species provided that they all have the same number of electrons and the same electronic configuration.

Hence, in each group of isoelectronic species, one electronic configuration can be written for all the species and it will accurately represent the number of electrons for all species in the group since they have the same number of electrons.

For instance, all group C members have the electronic configuration, 1s2. This means that they all possess only two electrons.