| A | B |
|---|
| Chemical Formula | A precise statement that tells which elements are in a compound and their ratios |
| Chemically Stable | It describes an atom whose outer energy level is completely filled with electrons |
| Chemical Bond | The force that holds together the atoms in a compound; chemical bonding occurs because atoms of an a element become more stable by losing, gaining, and sharing electrons. |
| What happens to the properties of elements when atoms form compounds ? | They share electrons and form a "compound bond". |
| What is a chemical formula for a compound with one atom of Calcium and two atoms of Florine - | CaF2 |
| What is a chemical formula for two atoms of Aluminum and three atoms of Sulfur - | Al2S3 |
| Why do most elements tend to form compounds. | Because they are unstable and can share electrons in their outer energy levels. |
| Ion | Atoms that have a charge |
| Ionic bond | The force of attraction between the opposite charges of the ions in an ionic compound. |
| Convalent Bond | The attraction that forms between atoms when they share electrons |
| Polar Molecule | One that has a positive end. Non-Polar molecule-does not have opposite ends. |
| Nonpolar Molecule | Is a molecule that does not have oppositely charged ends |
| Toxic | Hazardous substance that can injure living tissue; toxic compounds are poisonous |
| Corrosive | Hazardous compound that attacks and alters metals, human tissue, or other materials;for example, oven cleaners and battery acids |
| Oxidation Number | A positive or negative number assigned to an element to show its combining ability in a compuond |
| Binary Compound | A compound that is composed of two(2) elements |
| Polyatomic ion | a postively or negetively charged, covalently bonded group of atoms |
| Hydrate | a compound that has water chemically attached to its ions |
| Subcript | a number written after a symbol tell how many atoms of that element are in a unit of the compond;written below |
| Superscript | a symbol written above the line |
| Anhydrous | means without water |
