Periodic Table and Elements

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Periodic Table

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A chart of the elements arranged in rows and columns showing the repeating pattern of their properties.

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Mendeleev

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Russian chemist who developed a periodic table of the chemical elements and predicted the discovery of several new elements (1834-1907).

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Periodic

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Repeating pattern.

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Modern Periodic Table

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Arranged by increasing atomic number.

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Atomic Number

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The number of protons in the nucleus of an atom.

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Group

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A column on the periodic table.

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Periods

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Horizontal rows on the periodic table.

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Metals

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Elements that are generally shiny, good conductors of heat and electric current, and malleable. Found on left side of periodic table.

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Nonmetals

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Elements that are poor conductors of heat and electric current. Found on right side of periodic table.

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Metalloid

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An element that has properties of both metals and nonmetals; found along the zig-zag line on the periodic table.