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A period is a part of the periodic table.

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Halogens are nonmetals and are also very reactive, and they have 7 outer level electrons.

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The nitrogen group contains two nonmetals, two metals, and two metalloids. its reactivity varies among the elements.

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The boron group has five metals and one metalloid also it's solids are at room tempurature

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Lanthanide metals are shiny reactive and are sometimes used to make steel.

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Alkaline-earth metals are less reactive than alkali metals.

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The noble gases group contains unreactive nonmetals that are also colorless and odorless.

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The oxygen group consists of three nonmetals, one metal, and one metalloid.

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Carbon elements reactivity varies among the element

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The atoms in actinides are radioactive.

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Transition metals Aren't as reactive as Alkaline-earth metals.

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Alkali metals are the first group of elements and are also the most reactive metals.

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A period is part of the periodic table

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A family or group is a bundle of elements that have similar characteristics.