click below
click below
Normal Size Small Size show me how
Noah Vega
Chapter 5 Vocabulary
Term | Definition |
---|---|
periodic table | An arrangement of elements in columns, based on a set of properties that repeat from row to row. |
period | A row in a periodic table of elements. |
group | a column of elements in a periodic table. |
periodic law | The pattern of repeating properties displayed by elements in the periodic table. |
atomic mass unit (amu) | One twelfth the mass of a carbon-12 atom. |
metals | Elements that are good conductors of heat and electric current. |
transition metals | Elements that form a bridge between elements on the left and right sides of the periodic 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 | The elements in Group 1A of the periodic table, not including hydrogen. |
alkaline earth metals | The elements in Group 2A of the periodic table. |
halogens | The elements in Group 7A of the periodic table. |
noble gases | The elements in Group 8A of the periodic table. |