| A | B |
|---|
| Chemical bond | The force of attraction that holds two atoms together |
| Valence electrons | The electrons in the outermost energy level of an atom |
| Group 1 & 2 Valence Electrons | Use the Group Number |
| Groups 13-18 Valence Electrons | Use the Group Number minus 10 |
| Electron Dot Diagram | The Atomic Symbol surrounded by dots for the number of valence electrons |
| Ionic Bond | Bond made by gaining or losing electrons, between metal & nonmetal |
| Ions | Charged particles formed when the number of protons and electrons are not equal |
| Superscript | Writing above the line, indicates charge |
| Subscript | Writing below the line, indicates quantity |
| Covalent Bonds | Force of attraction between atoms that result from sharing electrons – Between two or more nonmetals |
| Molecule | Neutral group of atoms held together by covalent bonds |
| Nonpolar bond | A covalent bond in which electrons are shared equally between atoms |
| Polar bond | A covalent bond in which electrons are shared unequally |
| Nonpolar molecule | A molecule that does NOT have oppositely charged ends |
| Polar molecule | Unequal sharing of electrons within a molecule, and nonsymmetrical shape, result in oppositely charged ends of the molecule |
| Oxidation Number | A positive or negative number that indicates how many electrons an atom has gained, lost, or shared to become stable |
| Cation | Positive ion |
| Anion | Negative ion |
| Polyatomic Ion | An ion formed by a group of covalently bonded atoms with a charge |
