Technetium

Transition Metal

First artificially produced element; radioactive; Tc-99m imaging.

Electronic Configuration

[Kr] 4d⁵ 5s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d⁵ 5s²

Electron shells

2e⁻

n=1

8e⁻

n=2

18e⁻

n=3

13e⁻

n=4

2e⁻

n=5

Atomic number

Atomic mass

98 u

Category

Transition Metal

Block / Group / Period

d · 7 · 5

Valence electrons

Oxidation states

+4, +7

Electronegativity

1.9

Atomic radius

183 pm

Ionization energy

702 kJ/mol

Electron affinity

53 kJ/mol

Melting point

2430 K / 2157 °C

Boiling point

4538 K / 4265 °C

Density

11.5 g/cm³

State at 25 °C

solid

Personal Notes

Add personal notes for Technetium here...