| A | B |
|---|
| VALENCE ELECTRONS | ELECTRONS FOUND IN THE OUTER |
| ENERGY LEVEL | any of the poissible energies an electron may have in an atome |
| ORBITAL | A region in an atom where there is a high probability of finding electrons |
| PERIODIC LAW | properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number |
| DIATOMIC | pure elements that form molecules consisting of two atoms bonded together |
| FAMILY | vertical column on periodic table, also known as a group; elements have similar chemical and physical properties and same number of valance electrons |
| PERIOD | horizontal row of elements; elements in the same row have same number of orbitals |
| LEWIS STRUCTURE | drawing of a molecule that illustrates the valence electrons for the element |
| ELECTRON CLOUD | current theory or model of the atom where electrons move three dimensionally within a given area |
| SUBSCRIPT | written in a chemical formula to communicate number of atoms of element in compound |
| MENDELEEV | father of periodic table: determined the relationship of elements to organize them into a table |
| MOSLEY | determined the atomic number NOT atomic weight determined order of elements in the periodic table |
| CATION | result of an element changing from neutral state to positive because the element gave up electrons |
| ANION | result of an element changing from neutral state to negative as a result of gaining electrons |
| ION | charged particle as a result of losing or gaining electrons |
| OXIDATION NUMBER | charge that atom would have if the compound was composed of ions |
| SUPERSCRIPT | SYMBOLIZES THE OXIDATION NUMBER OF AN ELEMENT |
| SUBSCRIPT | numbers that come after a symbol and below, tell you the number of. atoms of that element |
| 1 | number of atoms if element does not have a subscript |
