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One of the elements of Group 18 of the periodic table noble gases are unreactive.

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One of the elements of Group 17 of the periodic table.

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One of the elements of Group 2 of the periodic table.

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One of the elements of Group 1 of the periodic table.

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A vertical column of elements in the periodic table; elements in a group share chemical properties.

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A unit of geologic time that is longer than an epoch but shorter than an era.

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The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.

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Describes something that occurs or repeats at regular intervals.