| A | B |
|---|
| Electron dot diagram | a diagram of an atom,ion or molecule in which each dot represents a valence electron |
| Ion | an atom or group of atoms that has a positive or negative charge |
| Anion | an ion with a negative charge |
| Cation | an ion with a positive charge |
| Chemical bond | the force that holds atoms or ions together as a unit |
| Ionic bond | the force that holds cations and anions together |
| Chemical formula | notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound |
| Crystals | solids whose particles are arranged in a lattice structure |
| Covalent bonds | a chemical bond in which two atoms share a pair of valence electrons |
| Molecule | a neutral group of atoms that are joined together by one or more covalent bonds |
| Polar covalent bonds | a covalent bond in which electrons are not shared equally |
| Polyatomic ion | a covalently bonded group of atoms that has a positive or negative charge and acts as a unit |
| Metallic bond | the attraction between a metal cation and the shared electrons that surround it |
| Alloy | a mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal |
