| A | B |
|---|
| CHEMICAL and PHYSICAL properties of elements are periodic functions of thier ATOMIC NUMBERS | periodic law |
| HORIZONTAL row of elements on the periodic table. | period |
| Each COLUMN of elements on the periodic table | group |
| ORGANIZED PT: Saw that the propeties of elements were repepeatin adn therefore resulting in the periodic table | Mendeleev |
| MOST REACTIVE metal ; Soft enough to be cut with a knife | alkali metals |
| REACTIVE nonmetals because their atoms need to gain only one electron to have a complete outer level. | halogens |
| FULL OUTER SHELL, NEVER REACT; UNREACTIVE nonmetals | noble gases |
| Wide range of physical and chemical properties; Do not give away their electrons as easily as atoms; LESS reactive than the alkali metals and alkaline-earth metals | transition metals |
