| Element (Atom) Name | Protactinium |
| Symbol | Pa |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Actinide |
| Period Number (Periodic table) | 7 |
| Group number (Periodic table) | None |
| Atomic number | 91 |
| Atomic weight | 231.03588 (Ref: Jlab-ele091, ciaaw-protactinium, Nist-91) 231 (Ref: Lanl-91) |
| Atomic Radius | 243 pm (Van der Waals) (Ref: Lanl-91) |
| Density | 15.37 g/cm3 (Ref: Jlab-ele091) |
| Melting point | 1572°C (Ref: Jlab-ele091) 1568 °C (Ref: Lanl-91) |
| Boiling point | 4027 °C (Ref: Lanl-91) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d1 7s2 |
| Oxidation States | +5, +4 (Ref: Jlab-ele091) 2, 3, 4, 5 (Ref: Lanl-91) |
| Ionization Energy | 5.89 eV (Ref: Jlab-ele091) [5.89] eV (Ref: Nist-91) |
| Number of Stable Isotopes | 0 |
| InChI | InChI=1S/Pa (Ref: Pubchem-91) |
| InChI Key | XLROVYAPLOFLNU-UHFFFAOYSA-N (Ref: Pubchem-91) |
| Remarks | Radioactive |
REFERENCES
- Jlab-ele091: https://education.jlab.org/itselemental/ele091.html
- Lanl-91: https://periodic.lanl.gov/91.shtml
- ciaaw-protactinium: https://www.ciaaw.org/protactinium.htm
- Nist-91: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=91
- Pubchem-91: https://pubchem.ncbi.nlm.nih.gov/element/91
- science.co.il: https://www.science.co.il/elements/
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