75
Re
186.207
Rhenium
Transition Metal
Group 7
Period 6
Block d
Rhenium is a chemical element of the periodic table with chemical symbol Re and atomic number 75 with an atomic weight of 186.207 u and is classed as transition metal and is part of group 7 (manganese group). Rhenium is solid at room temperature.
Rhenium in the periodic table
| Symbol | Re |
| Atomic number | 75 |
| Group | 7 (Manganese group) |
| Period | 6 |
| Block | d |
| Classification | Transition Metal |
| Appearance | Silvery-grayish |
| Color | Gray |
| Number of protons | 75 p+ |
| Number of neutrons | 111 n0 |
| Number of electrons | 75 e- |
From Wikipedia, the free encyclopediaRhenium 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.
Physical properties
| Phase at STP | Solid |
| Density | 21.02 g/cm3 |
| Atomic weight | 186.207 u |
Thermal properties
| Melting point | 3459 K 3185.85 °C 5766.53 °F |
| Boiling point | 5869 K 5595.85 °C 10104.53 °F |
| Heat of vaporization | 707.1 kJ/mol |
Atomic properties
| Electronegativity (Pauling Scale) | 1.9 |
| Electron affinity | 5.8273 kJ/mol |
| Oxidation states | −3, −1, 0, +1, +2, +3, +4, +5, +6, +7 (a mildly acidic oxide) |
| Ionization energies |
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Electron configuration for rhenium
Electron configuration Shorthand configuration | [Xe] 4f14 5d5 6s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d5 6s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 13, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valence electrons (incl. d) | 7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Rhenium (Re) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Rhenium
| Discovery | Walter Noddack, Ida Noddack, Otto Berg (1925) |
| First isolation | Walter Noddack, Ida Noddack (1928) |
Discovery of rhenium In 1922, Walter Noddack and Ida Tacke (future spouses Noddack) began searching for the elements number 43 (technetium) and 75 (rhenium). The Noddacks extracted 1 mg of oxide of what they believed to be element number 75 from platinum ore, and by X-ray emission spectroscopy found lines belonging to element number 75. Then the Noddacks published the discovery of element number 75 and named it rhenium after the river Rhine in Europe. | |
| Original word | Rhenus |
| Language of origin | Latin |
| Name source | Place |
| Meaning | “Rhine river” |
| Country | Germany |
Naming The name is derived from Rhenus, the Latin name for the river Rhine, in honour of the German homeland of its discoverers. | |
