Protactinium [+]Compare [E]dit [H]istory

Aliases: Pa

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Object «Protactinium» has attributes

Attribute Value
Symbol Pa
Atomic number 91
Group name Actinide
Standard state Solid
Atomic mass 231.03588 u
Electron configuration [Rn]7s²5f²6d¹
Oxidation states
  • +4
  • +5
Electronegativity (pauling scale) 1.5
Atomic radius (van der waals) 243 pm
Ionization energy 5.89 eV
Melting point 1845 K
Density 15.37 g/cm³
Discovered 1913 year
Electron affinity Add
Boiling point Add

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There was one edit, no edits waiting approval. Last edited by fink.isabella(301), Jun 1, 2022 (17 fields were changed)
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