| A | B |
|---|
| alloys | a mixture composed of two or more elements, at least one of which is a metal |
| chemical formula | It tells the number of and type of atoms in the smallest unit of a substance. |
| coordination number | the number of ions of opposite charge that surround each ion in a crystal |
| electron dot structure | It represents the inner electrons and atomic nucleus; also called Lewis dot structure |
| formula unit | the lowest whole-number ratio of ions in an ionic compound |
| halide ion | a negative ion formed when a halogen atom gains an electron |
| ionic bonds | the electrostatic attraction that binds opposite charged ions together |
| ionic compounds | a compound composed of positive and negative ions |
| metallic bonds | the force of attraction that holds metals together; it has the attraction of free-floating valence electrons for positively charged metal ions. |
| octet rule | atoms react by gaining or losing electrons so as to get the stable electron structure of a noble gaas, usually 8 valence electrons. |
| valence electron | an electron in the highest occupied energy level (last orbit) of an atom. |
