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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.

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