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14 terms

PH Ch 5 The Periodic Table

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Periodic Table
is an arrangement of elements in columns, based on a set of properties that repeat from row to row.
Period
is a row in a periodic table of elements.
Group
is a column of elements in a periodic table.
Periodic Law
is the pattern of repeating properties displayed by elements in the periodic table.
Atomic Mass Unit (AMU)
is one-twelfth the mass of a carbon-12 atom.
Metals
are elements that are good conductors of heat and electric current.
Transition Metals
are elements that form a bridge between elements on the left and right sides of the periodic table.
Nonmetals
are elements that are poor conductors of heat and electron current.
Metalloids
are elements with properties that fall between those of metals and nonmetals.
Valence Electron
is an electron that is in the highest occupied energy level of an atom.
Alkali Metals
are the elements in Group 1A of the periodic table, not including hydrogen.
Alkaline Earth Metals
are the elements in Group 2A of the periodic table.
Halogens
are the elements in Group 7A of the periodic table.
Noble Gases
are the elements in Group 8A of the periodic table.