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Noble gas are unreactive nonmetals and are in group 18 of the periodic table

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Halogens are very reactive nonmetals because their atoms need to gain only one electron to have complete outer level

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called chalcogen, any of the six chemical elements making up Group 16

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Nitrogen group element, periodiclaw Encyclopædia Britannica, Inc.any of the chemical elements that constitute Group 15 (Va) of the periodic table.

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The boron group are the chemical elements in group  13 of the periodic table, comprising boron

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The carbon group is a periodic table groupconsisting of carbon

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The actinide series derives its name from the first element in the series, actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide

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metallic chemical elements withatomic numbers 57 through 71, from lanthanum through lutetium.[

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

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Alkaline-earth metals are less reactive than alkali metals are.

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Alkali metals are elements in group 1 of the periodic table. they share physical and chemical properties as shown in figure 1.

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the physical andis called a period

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Each horizontal row of elements on the periodic table is called a group