1. Metallic Compounds:
* Composition: Made exclusively of metal atoms.
* Examples: Alloys (like bronze - a mixture of copper and tin), pure metals (like gold, silver, iron).
2. Nonmetallic Compounds:
* Composition: Made exclusively of nonmetal atoms.
* Examples:
* Diatomic Molecules: Oxygen (O2), Nitrogen (N2), Hydrogen (H2), Fluorine (F2), Chlorine (Cl2), Bromine (Br2), Iodine (I2)
* Other: Phosphorus (P4), Sulfur (S8)
3. Ionic Compounds:
* Composition: Formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions). This typically involves a metal and a nonmetal.
* Examples: Sodium chloride (NaCl), Magnesium oxide (MgO), Calcium carbonate (CaCO3)
4. Covalent Compounds:
* Composition: Formed by the sharing of electrons between two or more nonmetal atoms.
* Examples: Water (H2O), Carbon dioxide (CO2), Methane (CH4), Glucose (C6H12O6)
Key Points:
* Metals tend to lose electrons and form positive ions (cations).
* Nonmetals tend to gain electrons and form negative ions (anions).
* Ionic compounds are typically solid at room temperature and have high melting points.
* Covalent compounds can be solids, liquids, or gases at room temperature and have varying melting points.
Let me know if you'd like more detailed examples or explanations about a specific type of compound!
