Question

what best describes valence electrons?
electrons in the outer-most shell.
electrons in the inner-most shell.
electron that became a beta particle.

Explanation:

Valence electrons are defined as the electrons present in the outermost shell of an atom, which are involved in chemical bonding. The second option refers to inner - shell electrons, and the third is related to beta decay (not valence electrons). So the correct description is "Electrons in the outer - most shell".

Answer:

Electrons in the outer - most shell.