Technetium

Transition metal · 96.90636 u · group 7, period 5

Technetium · Tc

Atomic number43

SymbolTc

CategoryTransition metal

Standard stateSolid

Group · Period · Block7 · 5 · d

Electron configuration[Kr]5s2 4d5

Atomic mass96.90636 u

Atomic radius209 pm

Protons / Neutrons / Electrons43 / 54 / 43

Shells (e⁻ per shell)2, 8, 18, 13, 2

Electronegativity (Pauling)1.9

Ionization energy7.28 eV

Electron affinity0.55 eV

Oxidation states+7, +6, +4

Melting point2.43e+3 K · 2.16e+3 °C

Boiling point4.54e+3 K · 4.26e+3 °C

Density11 g/cm³

Year discovered1937

CPK color

#3B9E9E

State at room temp (25 °C)

solid

Position