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6 Terms
1
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A naturally occurring or artificially produced element that has an unstable nucleus and emits radiation as it decays over time.
2
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Element with atomic number 1 and symbol H. It is the lightest and most abundant element in the universe. It has one proton and one electron. It is a colorless, odorless, and tasteless gas. It is highly flammable and is used in fuel cells and in the production of ammonia.