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#91 Protactinium - rarity ZERO-KELVIN
1st ionization energy 5.89 eV 0.85%
appearance Silvery-white metallic luster 0.85%
atomic mass 231.04 u 0.85%
atomic number 91 0.85%
atomic radius 243 picometers (van der Waals radius) 1.69%
boiling point 4300 K or 4027 °C or 7280 °F 0.85%
cas number 7440-13-3 0.85%
cas number of (cl2) - 99.15%
category Inner transition metals 23.73%
crystal structure Tetragonal 1.69%
density 15.37 g/cm3 0.85%
electronegativity 1.5 (Pauling scale) 1.69%
electronic configuration [Rn] 5f2 6d1 7s2 0.85%
electrons 91 0.85%
electrons arrangement 2, 8, 18, 32, 20, 9, 2 0.85%
main isotopes 231Pa 0.85%
melting point 1841 K or 1568 °C or 2854 °F 0.85%
neutrons 148 1.69%
position Group: actinides, Period: 7, Block: f 1.69%
rarity ZERO-KELVIN 33.33%
state Solid 72.88%
sublimation point - 99.15%
symbol Pa 0.85%
valence electrons - 61.02%
who discovered Kasimir Fajans (in 1913) 0.85%

Total Rarity Score: 1959.24

Rarity: #58/354

Protactinium

Collection: Bohring Atoms