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any of the chemically inert gaseous elements of group 8 A or 0 of the periodic table: helium, neon, argon, krypton, xenon, and radon. Expand. Also called inert gas. Origin of noble gas.

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any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g., iron, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.

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any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence.

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Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.

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any of the divalent strongly basic metals of group II of the periodic table comprising beryllium, magnesium, calcium, strontium, barium, and radium — called also alkaline earth; see Periodic Table. First Known Use: 1854.

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any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.

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Group Definition: In chemistry, a group is a vertical column in the Periodic Table. Groups may be referred to either by number or by name. For example, Group 1 is also known as the Alkali Metals. For further information, read about the Chemistry of groups..

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A period is the name given to a horizontal row of the periodic table. The periodic table has seven periods.