Tennessine (symbol Ts, atomic number 117) is the second-heaviest element, a synthetic halogen named after Tennessee. It is classified as a halogen and sits in group 17, period 7 of the periodic table.
Overview
Tennessine is the chemical element with atomic number 117 and the symbol Ts. With a standard atomic weight of [294], it is a halogen. In the periodic table it occupies group 17 and period 7, and under standard conditions it is normally a solid. Tennessine is the second-heaviest element, a synthetic halogen named after Tennessee.
Atomic structure
An atom of Tennessine has 117 protons in its nucleus and, when neutral, 117 electrons arranged in the configuration [Rn] 5f14 6d10 7s2 7p5. Tennessine has no stable isotope; the value [294] refers to the mass number of its most stable or most commonly produced isotope.
Discovery and place in the table
Tennessine was discovered in 2010 by Joint Institute for Nuclear Research, ORNL. It follows Livermorium (Lv) and precedes Oganesson (Og) in order of atomic number.
| Atomic number | 117 |
|---|---|
| Symbol | Ts |
| Atomic mass | [294] |
| Category | Halogen |
| Group | 17 |
| Period | 7 |
| Electron configuration | [Rn] 5f14 6d10 7s2 7p5 |
| Phase at STP | Solid |
| Discovered | 2010 (Joint Institute for Nuclear Research, ORNL) |