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chlorine, bromine, iodine, and astatine.

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Nitrogen, phosphorus, arsenic, antimony, and bismuth.

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The boron group are the chemicals ,elements in group 13 of the Periodic table

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chlorine, bromine, iodine, and astatine.

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any of the divalent strongly basic metals of group II of the periodic table  any of the divalent strongly basic metals  of group II of the periodic table

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any of the divalent strongly basic metals of group II of the periodic table

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A Period is the name given to a horizontal row of the periodic table.

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any of the seven chemical elements that make up Group 18

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The oxygen family consists of the elements that make up group 16 on the periodic table:

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The properties of the carbon group elements and those of their compounds are intermediate

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Any of a series of chemically similar metallic elements

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Any of the metallic elements  within Groups 3 through 12 in the Periodic Table.

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any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table

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There are 18 numbered groups in the periodic table and are also collums