what is an ion

An ion is an atom or molecule that has a net electrical charge due to losing or gaining one or more electrons. In their normal state, atoms are neutral because they have an equal number of positive protons and negative electrons. When that balance changes, an ion is formed. The

An ion is an atom or molecule that has a net electrical charge due to losing or gaining one or more electrons. In their normal state, atoms are neutral because they have an equal number of positive protons and negative electrons. When that balance changes, an ion is formed.

The Two Types of Ions

Ions are divided into two main categories based on their charge:

• Cations: Positively charged ions. They form when an atom loses electrons (leaving more protons than electrons).
• Anions: Negatively charged ions. They form when an atom gains electrons (leaving more electrons than protons).

Key Differences At a Glance

| Feature | Cation | Anion | |---|---|---| | Charge | Positive (+) | Negative (-) | | Electron Action | Lost electrons | Gained electrons | | Element Type | Mostly metals | Mostly non-metals | | Example | Sodium ($Na^+$) | Chloride ($Cl^-$) |

How Ions Form

1. Electron Transfer: A metal atom gives up an electron to a non-metal atom. 2. Attraction: The metal becomes a cation, and the non-metal becomes an anion. 3. Bonding: Their opposite charges attract, often creating ionic compounds like table salt ($NaCl$).