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the oxygen is in the row 6( or ment 16 row) oof the element.

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lanthanide series is a series of metallic elements  included in  Group 3 of the periodic table.

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There are two rows under the periodic table: the lanthanide and actinide series.

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The periodic table has five
chemically element fluorine , chlorine , bromine , iodine and astatine.

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

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any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 thourh 18 of the periodic table.

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the elements in groups 3 through 12 of the periodic table are called "transition metals".

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the Alkaline-Earth Metals are six chemical elements in column group 2 of the Periodic table.

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this group has more metal then the ader group.

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the period of table is a chart of all element.