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IGHS Winkels
Physical Science Chapter 5
| Term | Definition |
|---|---|
| Periodic Table | an arrangement of elements in columns, based on a set of properties that repeat from row to row |
| Period | each row in the table of elements |
| Periodic law | members of a group in the periodic table have similar chemical properties/pattern of repeating properties |
| Atomic Mass Unit | (amu) one twelfth the mass of a carbon-12 atom |
| Metals | elements that are good conductors of electric current and heat |
| Transition metals | elements that form a bridge between the elements on the left and right sides of the table |
| Nonmetals | elements that are poor conductors of heat and electric current |
| Metalloids | elements with properties that fall between those of metals and nonmetals |
| Valence electron | an electron that is in the highest occupied energy level of an atom |
| Alkali metals | have a single valence electron and are extremely reactive/table salt |
| Alkaline earth metals | have two valence electrons/magnesium and calcium |
| Halogens | have seven valence electrons/highly reactive non-metals |
| Noble gases | have eight valence electrons/Helium has two valence electrons/colorless, odorless, and unreactive |