BECE Science 2021 Paper

Concept:Ions are charged particles formed when atoms gain or lose electrons.Explanation:An atom that loses an electron has more protons than electrons.This gives the ion a positive charge.Positively charged ions are called cations.For example, $\mathrm{Na}$ loses one electron to form $\mathrm{Na}^{+}$.An atom that gains an electron becomes negatively charged and is called an anion.For example, $\mathrm{Cl}$ gains one electron to form $\mathrm{Cl}^{-}$.Since the question asks about losing an electron, the ion formed is a cation.Answer:B. a cation.