Question

fill in the blank question
a(n) is a charged particle that has either more or fewer electrons than protons.

Explanation:

An ion is defined as a charged particle. When an atom gains or loses electrons, it becomes an ion. If it gains electrons (more electrons than protons), it is a negatively - charged ion (anion). If it loses electrons (fewer electrons than protons), it is a positively - charged ion (cation). This fits the description in the question.

Answer:

ion