| A | B |
|---|
| valence electrons | electrons in the highest energy level |
| octet rule | atoms react to form the stable configuration of a noble gas |
| lattice energy | energy released when 2 oppositely charged ions form a compound |
| crystal lattice | a regular, repeating, 3-dimensional pattern that forms in a solid compound |
| electron dot diagram | a diagram where the valence electrons are represented as dots and arranged around the element’s symbol |
| cation | a positively charged ion, due to a loss of electrons |
| anion | negatively charged ion, due to a gain of electrons |
| ionic bond | the force of attraction binding oppositely charged ions together |
| metallic bond | the attraction of free-floating valence electrons for positively charged metal ions |
| electron affinity | energy released when an atom gains an electron |
| coordination number | the number of ions of opposite charge surrounding each ion in a crystal |
| empirical formula | lowest whole number ration of atoms in the smallest unit of a compound |
| molecular formula | ratio of atoms in a molecule, how it actually exists |
| ionization energy | amount of energy required to remove an electron from an atom |
| endothermic | a reaction in which energy is absorbed, feels cold |
| exothermic | a reaction in which energy is released, feels |
