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Download Periodic Table Vocab page 7
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Transcript
Periodic Table Vocab page 8 Atomic number: the number of protons in the nucleus of an atom. This number identifies the atom. Mass number: the number of protons and neutrons in the nucleus of an atom. Mass number = protons + neutrons Valence #: The number of outermost electrons in an atom. Periodic Table: An arrangement of elements in order of increasing atomic numbers that demonstrates the periodic patterns that occur among the elements. Period: Elements in a horizontal row on the periodic table Group: Elements in a vertical column on the periodic table; also called a family Metal: An element below and to the left of the stair-step line of metalloids; about 80% of the known elements are metals. Nonmetal: An element above and to the right of the stair-step line of metalloids. Metalloid: An element with properties of both metals and nonmetals located along the stair-step line on the right side of the periodic table.
