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Chapter 5 Vocabulary Review

periodic table

an arrangement of elements in columns, based on a set of properties that repeat from row to row

period

a horizontal row of elements in the periodic table

group

Vertical column of elements in the periodic table

periodic law

the pattern of repeating properties displayed by elements in the periodic table

atomic mass unit

exactly 1/12 the mass of a carbon-12 atom

metals

One of a class of elements that are good conductors of heat and electric current; metals tend to be ductile, malleable, and shiny

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 electrons

the electrons that are in the highest energy level of an atom and that are involved in chemical reactions

alkali metals

the elements in group 1A of the periodic table, not including hydrogen

alkaline earth metals

Group 2A elements in the modern periodic table

halogens

the elements in Group 7A on the periodic table.

noble gases

elements in group 8A.of the periodic table

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