75Re186.207
Rhenium
Transition Metal
Solid at STP
Period 6Group 7Block DDiscovered 1925
[Xe]6s2 4f14 5d5
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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 75 |
| Atomic Mass | 186.207 u |
| Electron Configuration | [Xe]6s2 4f14 5d5 |
| Oxidation States | +7, +6, +4 |
| Electronegativity | 1.9 (Pauling) |
| Atomic Radius | 217 pm |
| Ionization Energy | 7.88 eV |
| Electron Affinity | 0.15 eV |
| Block | D |
Physical Properties
| Appearance | silvery-grayish |
| Standard State | Solid |
| Melting Point | 3459 K (3185.8 °C) |
| Boiling Point | 5869 K (5595.9 °C) |
| Density | 20.8 g/cm³ |
| Molar Heat | 25.48 J/(mol·K) |
| CPK Color | #267DAB |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 6 |
| Group | 7 |
| Block | D |
Discovery
| Year Discovered | 1925 |
| Discovered By | Masataka Ogawa |
| Named By | Walter Noddack |
| Electron Shells | 2, 8, 18, 32, 13, 2 |