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repeated at irregular intervals

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The halogens are located on the left of the noble gases on the periodic table. cesium is a Halogens.

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Nitrogen is the elements of  nitrogen.

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chemical elements in group 13.

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atomic numbers 57 through 71,

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six chemical elements in column 2

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something that doesn't stop going and that repits .The days of the week is a period

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any of the seven chemical elements that make up Group 18,

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It consists of the elements oxygen.

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a periodic table group consisting of carbon,

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the  two rows under the periodic table

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are the chemical elements found in Group 1 of the periodic table. Hydrogen is a Alkali metal.

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elements between the two sides of the table.