52
Te
127.603
Tellurium
Metalloid
Group 16
Period 5
Block p
Tellurium is a chemical element of the periodic table with chemical symbol Te and atomic number 52 with an atomic weight of 127.603 u and is classed as metalloid and is part of group 16 (oxygen group). Tellurium is solid at room temperature.
Tellurium in the periodic table
| Symbol | Te |
| Atomic number | 52 |
| Group | 16 (Oxygen group) |
| Period | 5 |
| Block | p |
| Classification | Metalloid |
| Appearance | - |
| Color | Silver |
| Number of protons | 52 p+ |
| Number of neutrons | 76 n0 |
| Number of electrons | 52 e- |
From Wikipedia, the free encyclopediaTellurium is a chemical element with symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur.
Physical properties
| Phase at STP | Solid |
| Density | 6.24 g/cm3 |
| Atomic weight | 127.603 u |
Thermal properties
| Melting point | 722.66 K 449.51 °C 841.118 °F |
| Boiling point | 1261 K 987.85 °C 1810.13 °F |
| Heat of vaporization | 50.63 kJ/mol |
Atomic properties
| Electronegativity (Pauling Scale) | 2.1 |
| Electron affinity | 190.161 kJ/mol |
| Oxidation states | −2, −1, +1, +2, +3, +4, +5, +6 (a mildly acidic oxide) |
| Ionization energies |
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Electron configuration for tellurium
Electron configuration Shorthand configuration | [Kr] 4d10 5s2 5p4 | ||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4 | ||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 18, 6 | ||||||||||||||||||||||||||||||||||||||
| Valence electrons | 6 | ||||||||||||||||||||||||||||||||||||||
| Valency electrons | 2,4,6 | ||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Tellurium (Te) atom. | ||||||||||||||||||||||||||||||||||||||
Orbital Diagram |
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The history of Tellurium
| Discovery | Franz-Joseph Müller von Reichenstein (1782) |
| First isolation | Martin Heinrich Klaproth |
| Named by | Martin Heinrich Klaproth (1798) |
Discovery of tellurium Tellurium (Latin tellus meaning "earth") was discovered in the 18th century in a gold ore from the mines in Kleinschlatten (today Zlatna), near today's city of Alba Iulia, Romania. In 1782 Franz-Joseph Müller von Reichenstein, who was then serving as the Austrian chief inspector of mines in Transylvania, concluded that the ore did not contain antimony but was bismuth sulfide. The following year, he reported that this was erroneous and that the ore contained mostly gold and an unknown metal very similar to antimony. After a thorough investigation that lasted three years and included more than fifty tests, Müller determined the specific gravity of the mineral and noted that when heated, the new metal gives off a white smoke with a radish-like odor; that it imparts a red color to sulfuric acid; and that when this solution is diluted with water, it has a black precipitate. Nevertheless, he was not able to identify this metal and gave it the names aurum paradoxum (paradoxical gold) and metallum problematicum (problem metal), because it did not exhibit the properties predicted for antimony. In 1789, a Hungarian scientist, Pál Kitaibel, discovered the element independently in an ore from Deutsch-Pilsen that had been regarded as argentiferous molybdenite, but later he gave the credit to Müller. In 1798, it was named by Martin Heinrich Klaproth, who had earlier isolated it from the mineral calaverite. | |
| Original word | tellus |
| Language of origin | Latin |
| Name source | Astronomical body |
| Meaning | “Earth” |
Naming The name is derived from the Latin word 'tellus', meaning Earth, chosen to mirror selenium (named after the Moon) which is chemically similar. | |