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In chemistry, a group is a vertical column in the Periodic Table

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In chemistry, the term transition metal (or transition element) has three possible meanings: The IUPAC definition defines a transition metal

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any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table

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any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.

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Any of a group of metallic elements including calcium, strontium, magnesium, barium, beryllium, and radium.

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any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table

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a number of people or things that are located close together or are considered or classed together.

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A period is the name given to a horizontal row of the periodic table. ... Period 1 contains only two elements: hydrogen and helium