Tennessine (Ts) — element 117halogen · group 17, period 7
Tennessine is a chemical element with the symbol Ts and atomic number 117. It is a halogen in group 17, period 7 of the periodic table (the p-block), with a standard atomic mass of [294] u. At room temperature (25 °C) tennessine is predicted to be a solid.
# Tennessine properties
| Symbol | Ts |
|---|---|
| Atomic number | 117 |
| Atomic mass | [294] u |
| Category | halogen |
| Group | 17 |
| Period | 7 |
| Block | p-block |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁵ |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 7 |
| Protons / electrons | 117 / 117 |
| State at 25 °C | predicted solid |
| Melting point | 723 K (449.9 °C, 841.7 °F) (predicted) |
| Boiling point | 883 K (609.9 °C, 1129.7 °F) (predicted) |
| Density | 7.2 g/cm³ (predicted) |
| Electronegativity (Pauling) | — |
| First ionization energy | — |
| Atomic radius | — |
| Discovered | 2009 |
Values for superheavy elements are theoretical predictions; none have been measured in bulk.
# Electron configuration of tennessine
The electron configuration of tennessine is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵, written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁵. Its 117 electrons fill 7 shells as 2, 8, 18, 32, 32, 18, 7, so the outermost shell holds 7 electrons. As a group 17 element, tennessine has 7 valence electrons. Because only a few atoms have ever been made, this configuration is a theoretical prediction.