Atomic Element Z = 43 • Transition Metal
Technetium (Tc) — Atomic Data, Electron Shells & Reactions
Technetium (symbol Tc, atomic number 43) has a standard atomic weight of 98 u and ground-state configuration [Kr] 4d5 5s2.
Atomic Number (Z)
43
IUPAC Symbol
Tc
Standard Atomic Weight
98 g/mol
Period / Group / Block
5 / 7 / d-block
Condensed Electron Config
[Kr] 4d5 5s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2
Principal Shell Occupancy
[2, 8, 18, 13, 2]
Pauling Electronegativity
1.9
First Ionization Energy
702 kJ/mol
Covalent Radius
147 pm
Melting Point
2430 K (2156.85 °C)
Boiling Point
4538 K (4264.85 °C)
Density
11.5 g/cm³
Oxidation States
+7, +4
Tc (Z=43) — Valence shell highlighted in vermilion