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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 | Each row in a table of elements |
group | Each column on a periodic table |
Periodic Law | The pattern of repeating properties |
atomic mass unit | The value that depends on the distribution of isotopes |
metals | 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 electrical current |
metalloids | Elements with properties that fall between the two categories. |
valence electrons | An electron that is in the highest occupied energy group of an atom. |
alkali metals | Elements in group 1A |
alkaline earth metals | Elements in group 2A |
halogens | elements in group 7A |
noble gases | Elements in group 8A |