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What is protactinium?

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... protactinium , radioactive chemical element; symbol Pa; at. no. 91; at. wt. 231.0359; m.p. greater than 1,600°C; b.p. 4,026°C; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal.

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Newspaper article from: The Independent - London ...One of its neutrons turns into a proton and it becomes protactinium-234, with 91 protons and 143 neutrons. One of the orbiting...partner as the proton changes its form, and so breaks away. Protactinium-234 is itself extremely unstable and loses no time in changing...
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Magazine article from: Multinational Monitor ...least 4.5 billion years. Even when U-238 does decay, it turns first into thorium-234 and then into protactinium-234. Protactinium-234 releases highly potent beta particles that may lead to cancerous growth in body cells. The U.S...
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