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43 - Technetium transition metal

Discovered by Emilio Segrè in 1937

Technetium

Technetium (/tɛkˈniːʃiəm/) is a chemical element with symbol Tc and atomic number 43. It is the element with the lowest atomic number in the periodic table that has no stable isotopes:every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature.
Shell Electrons Orbitals
1 2 2 in 1s
2 8 2 in 2s + 6 in 2p
3 18 2 in 3s + 6 in 3p + 10 in 3d
4 13 2 in 4s + 6 in 4p + 5 in 4d
5 2 2 in 5s
TechnetiumTc Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 1 Electron 2
98  u Atomic Mass
2  Å Atomic Radius
5150  K Boiling Point
1.47  Å Covalent Radius
11  g/cm³ Density
53 Electron Affinity
1.9 Electronegativity
7.28  eV First Ionization Energy
2473.15  K Melting Point
5 Number of Shells
43 Atomic Number
2, 8, 18, 13, 2 Electron Shell Occupations