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

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is a gas at room temperature, makes up about 80% of the air you breathe.

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The most common element from Group 13 is aluminum, and it has three electrons.

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The lanthanides are shiny, reactive metals.

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are less reactive than alkali metals are

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Arranged in series or rows.

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are unreactive nonmetals and are in Group 18 of the periodic table.

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Oxygen makes up about 20% of air.

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carbon can be found uncombined in nature.Carbon also forms a wide variety of compounds.

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All atoms of actinides are radioactive, or unstable.

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Groups 3-12 do not have individual names. Instead, all of these groups are called transition metals.

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are elements in Group 1 of the periodic table

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A group of elements that have the same electrons.