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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.

ShellElectronsOrbitals
122 in 1s
282 in 2s + 6 in 2p
3182 in 3s + 6 in 3p + 10 in 3d
4132 in 4s + 6 in 4p + 5 in 4d
522 in 5s
TechnetiumTcElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 9Electron 10Electron 11Electron 12Electron 13Electron 14Electron 15Electron 16Electron 17Electron 18Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 9Electron 10Electron 11Electron 12Electron 13Electron 1Electron 2
98  u Atomic Mass
2  Å Atomic Radius
5.15k  K Boiling Point
1.47  Å Covalent Radius
11  g/cm³ Density
53 Electron Affinity
1.9 Electronegativity
7.28  eV First Ionization Energy
2.47k  K Melting Point
5 Number of Shells
43 Atomic Number
2, 8, 18, 13, 2 Electron Shell Occupations