* Calcium ion (Ca²⁺): A positively charged ion formed when a calcium atom loses two electrons.
* Chloride ion (Cl⁻): A negatively charged ion formed when a chlorine atom gains one electron.
In CaCl₂, there are two chloride ions (Cl⁻) for every one calcium ion (Ca²⁺). This arrangement ensures the overall charge of the compound is neutral.
Compound ions are polyatomic ions composed of multiple atoms bonded together with a net positive or negative charge. Examples include:
* Sulfate ion (SO₄²⁻)
* Nitrate ion (NO₃⁻)
* Ammonium ion (NH₄⁺)
Therefore, CaCl₂ is not a compound ion but an ionic compound formed by the combination of simple ions.
