Question

beryllium has the electron configuration 1s²2s². what are the electrons in the 1s sublevel called? a inner - shell electrons b covalent electrons c anti - valence electrons d valence electrons

Explanation:

• Inner - shell electrons are the electrons that are not in the outermost shell (valence shell). In beryllium's electron configuration \(1s^{2}2s^{2}\), the \(1s\) electrons are in an inner shell.
• Covalent electrons are a misnomer in this context. Covalent bonds involve sharing of valence electrons, but there is no such thing as "covalent electrons" as a standard electron type term.
• Anti - valence electrons is not a recognized term in electron configuration terminology.
• Valence electrons are the electrons in the outermost shell. For beryllium, the valence electrons are in the \(2s\) sub - level (\(2s^{2}\)), not the \(1s\) sub - level.

Answer:

A. inner - shell electrons