Positive ions differ from neutral atoms in that...?
A) positive ions have lost protons.
B) positive ions have gained protons.
C) positive ions have lost electrons.
D) positive ions have gained electrons.
Since the ion is positive, it means it has more protons (positive charged particles) than electrons (negative charged particles). Particles that get “passed around” between atoms (in ionisation) are electrons, so the answer is C.