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#57 Lanthanum - rarity ZERO-KELVIN
1st ionization energy 5.577 eV 0.85%
appearance Silvery white metallic 5.08%
atomic mass 138.91 u 0.85%
atomic number 57 0.85%
atomic radius 240 picometers (van der Waals radius) 1.69%
boiling point 3737 K or 3464 °C or 6267 °F 0.85%
cas number 7439-91-0 0.85%
cas number of (cl2) - 99.15%
category Lanthanides 0.85%
crystal structure Double hexagonal close packed 5.08%
density 6.15 g/cm3 0.85%
electronegativity 1.1 (Pauling scale) 1.69%
electronic configuration [Xe] 5d1 6s2 0.85%
electrons 57 0.85%
electrons arrangement 2, 8, 18, 18, 9, 2 0.85%
main isotopes 139La 0.85%
melting point 1193 K or 920 °C or 1688 °F 0.85%
neutrons 82 2.54%
position Group: lanthanides, Period: 6, Block: d 0.85%
rarity ZERO-KELVIN 33.33%
state Solid 72.88%
sublimation point - 99.15%
symbol La 0.85%
valence electrons - 61.02%
who discovered Carl Gustaf Mosander in 1838 0.85%

Total Rarity Score: 1974.69

Rarity: #50/354

Lanthanum

Collection: Bohring Atoms