Answer to Question #338890 in General Chemistry for Rachel

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 Kr.

Answer 1

Which 3 ion is isoelectronic with Kr?

Magnesium, Mg , has 12 electrons, so Mg2+ will have 10 electrons. Finally, strontium, Sr , has 38 electrons, which implies that the Sr2+ cation will have 36 electrons → is isoelectronic with a neutral krypton atom.

The electron configuration of Ba2+ is isoelectronic with the noble gas: Kr b.