rubidium

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Definition/MeaningWord/Phrase
any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium) alkali metal , alkaline metal
geological dating based on the proportions of radioactive rubidium into its decay product strontium; radioactive rubidium has a half-life of 47,000,000,000 years rubidium-strontium dating
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