What is an ion, anion and cation? Give example for each. [3 MARKS]
Each point: 1 Mark
1. An ion is a charged particle and can be negatively or positively charged. Eg: Ca2+, OH−
2. A cation is an atom or a molecule which is positively charged, i.e. has more number of protons than electrons. Eg: Na+
3. An anion is an atom or a molecule which is negatively charged, i.e. has more number of electrons than protons. Eg: Cl−