Question

Which ion below has a noble gas configuration?

Be2+, B2+, Li2+, C2+, N2-

Answer 1

Dear Student,

Noble gas configuration is the term given to the electron configuration of noble gases.

Among the following ions Beryllium [Be⁺²] has the noble gas configuration which is given as [He] 2s².

Beryllium : Be⁺² = [He] 2s²

Here, Beryllium is a alkaline earth metal which refers to s-block.

The S block in the periodic table of elements occupies the alkali metals and alkaline earth metals, also known as groups 1 and 2. Helium is also part of the S block. The principal quantum number “n” fills the s orbital. There is a maximum of two electrons that can occupy the s orbital.

Therefore, the answer is [Be⁺²] has the noble gas configuration.