Question

which two types of particles are present in equal numbers in an atom, but not in an ion? a. protons and electrons b. protons and neutrons c. inner - shell electrons and outer - shell electrons

Explanation:

An atom is electrically neutral, so the number of positively - charged protons equals the number of negatively - charged electrons. An ion is formed when an atom gains or loses electrons, disrupting this balance. Protons and neutrons are not related in this context regarding charge balance. Inner - shell and outer - shell electrons don't have a fixed equal number relationship in atoms or ions.

Answer:

A. protons and electrons