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Prometthium Is The 61 Element

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Prometthium Is The 61 Element
Promethium is the 61 element of the periodic table. All of its isotopes are radioactive so scientists can’t work with it with out the proper gear. An isotope is any of two or more forms of an element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights.
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