Tennessine is one of the rarest and heaviest elements in the known universe. With the atomic number 117, it sits within a mysterious region of the periodic table known as the superheavy elements, a realm where the familiar rules of chemistry begin to blur under the influence of extreme nuclear forces.
It was first synthesised in 2010 through a delicate collision of berkelium and calcium nuclei, an astonishing feat of precision that lasted mere milliseconds. Yet in those fleeting moments, we caught a glimpse of nature at its most exotic, hinting at a theoretical “island of stability,” where certain superheavy elements may last long enough to study more deeply.
Though Tennessine exists only briefly before decaying, its discovery expands our understanding of atomic structure and the forces that bind the universe together.
What Elements Are Like Tennessine
Tennessine belongs to a group of elements known as the halogens, which includes fluorine, chlorine, bromine, iodine, and astatine. These elements typically share similar chemical behaviours, such as forming salts when combined with metals.
But Tennessine is different. While it sits beneath astatine in Group 17 of the periodic table, its immense atomic mass and fleeting existence mean its chemistry is mostly theoretical. The usual patterns seen in lighter halogens begin to break down, influenced by relativistic effects, where electrons move so fast they behave in ways not predicted by classical physics.
In this sense, elements like astatine and other superheavy elements such as livermorium (element 116) or oganesson (element 118) offer the closest parallels. Together, they form part of the frontier of the periodic table, an edge where we explore not just new elements, but the limits of matter itself.
Tennessine (Ts) – Quick Overview
| Property | Details |
|---|---|
| Atomic Number | 117 |
| Symbol | Ts |
| Group | 17 (Halogens) |
| Period | 7 |
| Block | p-block |
| Element Type | Superheavy, Synthetic |
| Discovered | 2010 (JINR & US Labs) |
| Named After | Tennessee region (USA) |
Predicted Physical Properties
| Property | Value |
|---|---|
| Phase at STP | Solid (predicted) |
| Appearance | Semimetallic (predicted) |
| Melting Point | 350–550 °C (623–823 K) |
| Boiling Point | ~610 °C (883 K) |
| Density | ~7.1–7.3 g/cm³ (extrapolated) |
Atomic Structure
| Property | Details |
|---|---|
| Electron Configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ (predicted) |
| Electrons per Shell | 2, 8, 18, 32, 32, 18, 7 |
| Covalent Radius | ~156–157 pm (predicted) |
| Atomic Radius | ~138 pm (empirical estimate) |
Ionization Energies (Predicted)
| Ionization Step | Energy (kJ/mol) |
|---|---|
| 1st | 742.9 |
| 2nd | 1435.4 |
| 3rd | 2161.9 |
Chemical Behavior
| Property | Details |
|---|---|
| Oxidation States | Possibly −1 or +5 |
| Element Category | Halogen (but behaviour unclear) |
| Similar Elements | Astatine, Livermorium, Oganesson |
Isotopes of Tennessine
| Isotope | Half-Life | Decay Mode | Decay Product |
|---|---|---|---|
| ²⁹³Ts | ~22 ms | Alpha (α) | Moscovium-289 |
| ²⁹⁴Ts | ~51 ms | Alpha (α) | Moscovium-290 |
Other Key Facts
| Property | Value |
|---|---|
| Natural Occurrence | Synthetic only |
| CAS Number | 54101-14-3 |
| Mass Number | [294] (approximate) |
| Stability | Extremely short-lived |
What Does Tennessine Look Like?
Tennessine has never been directly observed because it exists for only milliseconds before decaying. Based on its position in the periodic table, scientists predict it would likely be a dark, metallic solid, probably with a shiny, lustrous appearance similar to other heavy elements in its group.
Since it’s part of the halogen family, it might have some resemblance to iodine’s dark purple color, though it would be much denser and heavier. However, because tennessine can only be created a few atoms at a time in particle accelerators and disappears almost instantly, we can only theorize about its appearance based on atomic theory rather than actual observation.
What is Tennessine Used For?
Tennessine currently has no practical uses. It exists only in research laboratories where scientists create a few atoms at a time in particle accelerators, and these atoms decay within milliseconds. The element serves purely as a tool for advancing our understanding of atomic physics and testing theories about how heavy elements behave.
Researchers study tennessine to learn more about the structure of atomic nuclei and to search for the predicted “island of stability”, a theoretical region where superheavy elements might last longer and potentially have useful properties.