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#43 Technetium - rarity ZERO-KELVIN
1st ionization energy 7.28 eV 0.85%
appearance Shiny gray metallic luster 0.85%
atomic mass 98 u 0.85%
atomic number 43 0.85%
atomic radius 209 picometers (van der Waals radius) 3.39%
boiling point 4538 K or 4265 °C or 7709 °F 0.85%
cas number 7440-26-8 0.85%
cas number of (cl2) - 99.15%
category Transition metals 25.42%
crystal structure HCP (Hexagonal close packing) 6.78%
density 11.5 g/cm3 0.85%
electronegativity 1.9 (Pauling scale) 3.39%
electronic configuration [Kr] 4d5 5s2 0.85%
electrons 43 0.85%
electrons arrangement 2, 8, 18, 13, 2 0.85%
main isotopes - 7.63%
melting point 2430 K or 2157 °C or 3915 °F 0.85%
neutrons 55 0.85%
position Group: 7, Period: 5, Block: d 0.85%
rarity ZERO-KELVIN 33.33%
state Solid 72.88%
sublimation point - 99.15%
symbol Tc 0.85%
valence electrons - 61.02%
who discovered Carlo Perrier and Emilio Segrè in 1973 0.85%

Total Rarity Score: 1868.82

Rarity: #75/354

Technetium

Collection: Bohring Atoms