* Halogens:
* Fluorine (F): Calcium fluoride (CaF₂), found in toothpaste.
* Chlorine (Cl): Calcium chloride (CaCl₂), used to de-ice roads.
* Bromine (Br): Calcium bromide (CaBr₂), used in photography.
* Iodine (I): Calcium iodide (CaI₂), used as a dietary supplement.
* Oxygen (O): Calcium oxide (CaO), also known as quicklime, is a major component of cement.
* Sulfur (S): Calcium sulfide (CaS), used in the production of pigments.
* Nitrogen (N): Calcium nitride (Ca₃N₂), a compound found in some fertilizers.
How Ionic Bonds Form with Calcium:
1. Calcium loses electrons: Calcium has two valence electrons (electrons in its outermost shell). To achieve a stable octet (8 electrons), it readily loses these two electrons, forming a positively charged calcium ion (Ca²⁺).
2. Nonmetal gains electrons: Nonmetals gain electrons to achieve a stable octet. For example, chlorine needs one electron to complete its octet.
3. Electrostatic attraction: The oppositely charged ions (Ca²⁺ and Cl⁻ in the case of calcium chloride) attract each other strongly due to electrostatic forces, forming an ionic bond.
Important Note: The specific nonmetal that reacts with calcium will determine the formula of the ionic compound formed. For example, calcium reacts with fluorine to form CaF₂ (one calcium atom loses two electrons, and two fluorine atoms each gain one electron).
