| A | B |
|---|
| actinide series | elements with atomic numbers 90-103 |
| alkali metals | the group 1A / 1 elements, except hydrogen |
| alkaline earth metals | the Group 11A / 2 elements |
| electron configuration | the arrangement of electrons bey sublevels according to increasisng energy |
| electron dot formula | a symbolic diagram for an element and its valence electrons |
| Group | a vertical column of elements with similar properties |
| halogens | the GroupV11A / 17 elements |
| inner transition elements | lanthanide and actinide series |
| ion | an atom that bears a charge as the result of gaining or losing valence electrons |
| ionic charge | the + charge on a metal atom that lost electrons or the (-) charge on a nonmetal atom that has gained electrons |
| ionization energy | amt of energy needed to remove an electon from a neutral atom |
| lanthanide series | elements with atomic #s 58-71 |
| nobel gases | relatively unreactive Group V111A / 18 elements |
| period | horizontal row of elements with properties varying from metallic to nonmetallic |
| representative elements | Group a (1,2,13-18)elements |
| Transition elements | Group B (3- 12) elements |
| valence electrons | electrons that occuppy the outermost s and p sublevels of an atom |
