Periodic Table of the Elements: Protactinium

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Periodic Table of the Elements: Protactinium
Atomic Number:91
Atomic Symbol:Pa
 Protactiniumprotactinium
, radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope 231; 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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Atomic Weight:231.03588
Electron Configuration:2 · 8 · 18 32 · 20 9 · 2
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