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This odorless, colorless gas has eight protons in the nucleus, and is pale blue in its liquid and solid states.

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It is an intensely white metal that quickly tarnishes to black in the presence of air. Interesting Radium Facts: Radium was discovered by Pierre and Marie Curie in 1898. They extracted the element from a sample of the mineral uraninite.

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Potassium was the first elemental metal to be found through electrolysis.

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Sodium is a vital element for living organisms. Of the twenty known isotopes of sodium, only one—Na-23—is stable.

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lime.” This makes sense since calcium is extracted from limestone, and also from marble and chalk.

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About 20% of the weight of living organisms is carbon.

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Although it is metal you can still cut it with a knife