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14 terms

Chapter 5- The Periodic Table

Chapter 5 Vocabulary Review
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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