Question

Give the symbol for:

a. the cation possessing a positive one charge that is isoelectronic with argon.
b. the anion possessing a negative two charge that is isoelectronic with krypton.

Answer 1

The cation isoelectronic with argon is K+, and the anion isoelectronic with krypton is Se2-.

Step-by-step explanation:

The symbol for the cation possessing a positive one charge that is isoelectronic with argon is K+. This cation is formed when a potassium atom loses one electron, thus having the same electron count as argon. For the anion possessing a negative two charge that is isoelectronic with krypton, the symbol is Se2-. This anion forms when a selenium atom gains two electrons, resulting in the same number of electrons as krypton.

Answer 2

a. K⁺

b. Se²⁻

Step-by-step explanation:

Isoelectronic species are those that have the same number of electrons.

a.

Ar has 18 electrons. K has 19 electrons, so when it loses 1 electron to form K⁺, it is isoelectronic with Ar.

b.

Kr has 36 electrons. Se has 34 electrons, so when it gains 2 electrons to form Se²⁻, it is isoelectronic with Kr.