Periodic Table of the Elements: Protactinium
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| 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. ..... Click the link for more information. | |
| Atomic Weight: | 231.03588 |
| Electron Configuration: | 2 · 8 · 18 32 · 20 9 · 2 |