75 - Rhenium transition metal
Discovered by Masataka Ogawa in 1925
Rhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.
Periodic table
| 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 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 13 | 2 in 5s + 6 in 5p + 5 in 5d |
| 6 | 2 | 2 in 6s |
Electron shells
silvery-grayish Appearance
186 u Atomic Mass
1.35 Å Atomic Radius
5.87k K Boiling Point
7 Group
4, 7 Common Oxidation States
1.51 Å Covalent Radius
21 g/cm³ Density
5.83 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5 Electron Configuration
[Xe] 4f14 5d5 6s2 Electron Configuration (semantic)
1.9 Electronegativity
75 Electrons
7.83 eV First Ionization Energy
3, 4, 5, 6, 7 ICSD Oxidation States
760, 1260, 2510, 3640 kJ/mol Ionization Energies
3.45k K Melting Point
58 Mendeleev Number
25.5 J/(mol·K) Molar Heat
6 Number of Shells
111 Neutrons
75 Atomic Number
21 Number of Isotopes
-3, -1, 1, 2, 3, 4, 5, 6, 7 Oxidation States
6 Period
Solid Phase
75 Protons
2, 8, 18, 32, 13, 2 Electron Shell Occupations