Protactinium

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This editable Main Article is under development and subject to a disclaimer.

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| Protactinium | 231.03588(2) |

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| Pa

1s22s22p63s23p63d104s24p6 4d105s25p64f145d106s26p65f26d17s2 |
[ ? ] | Actinide:

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Hazard:
Radioactive and toxic.

Protactinium is a chemical element, having the chemical symbol Pa. Its atomic number (the number of protons) is 91. It has a standard atomic weight of 231.0359 g•mol −1 and it is a solid in its elemental form.

Protactinium is considered a member of the "Actinide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of ~4,000 °C and a melting point of 1,572 °C.