# data[].attributes.body
any of the gaseous elements helium neon argon krypton xenon and radon occupying groups of the periodic table they were long believed to be totally unreactive but compounds of xenon krypton and radon are now know

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the process or a period of changing from one state or condition to another

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any of the series of fifteen metallic elements from actinium to lawrencium in the periodic table they are all radioactive the heavier members being extremely unstables

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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 the elements beryllium magnesium calcium strontium barium and radium occupying group llA of the periodic table they are reactive electromotive divalent metals divalent metals and form basic oxides that react with water to form comparatively insoluble hydroxides

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any of the elements lithium sodium potassium rubidium cesium and francium occupying group 1A of the period table they are very reactive electromotive monovalent metals forming strongly alkaline hydroxides

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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 length or portion of time