| A | B |
|---|
| periodic | in a regular repeating pattern |
| Periodic Law | states the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements |
| metal | shiny, ductile, malleable, and thermal and electrically conductive elements. |
| Nonmetals | not malleable or ductile elements that are not thermally or electrically conductive |
| metalloids | also called semiconductors, share properties of both metals and nonmetals |
| period | horizontal rows on the periodic table |
| group | vertical rows on the periodic table |
| alkali metals | soft, very reactive metals, mix with halogens to form salts |
| alkaline-earth metals | less reactive than alkali metals, have two outer electrons |
| alkali metals | have only one outer shell electron |
| transition metals | groups 3-12 on the periodic table |
| boron group | these elements have 3 outer shell electrons |
| carbon group | these elements have 4 outer shell electrons |
| nitrogen group | these elements have 5 outer shell electrons |
| oxygen group | these elements have 6 outer shell electrons |
| Halogens | these elements have 7 outer shell electrons, they are in group 17 and react with alkali metals to form salts |
| noble gases | these elements have 8 outer shell electrons, unreactive and inert |
| hydrogen | the most abundant element in the universe |
