Tennessine (Ts): electron configuration, atomic mass and facts
Tennessine (Ts) is element 117 of the periodic table, a halogen (predicted) in period 7, group 17. Its electron configuration is [Rn] 5f14 6d10 7s2 7p5, with electrons arranged in shells 2, 8, 18, 32, 32, 18, 7, and its most stable isotope has mass number 294.
▶ Watch Tennessine’s electrons orbit in the interactive periodic tableTennessine at a glance
| Symbol | Ts |
|---|---|
| Atomic number | 117 |
| Atomic mass | [294] u (most stable isotope) |
| Category | Halogen (predicted) |
| Group | 17 |
| Period | 7 |
| Block | p-block |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p5 |
| Noble-gas shorthand | [Rn] 5f14 6d10 7s2 7p5 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 7 |
| Outer-shell electrons | 7 |
| Electronegativity (Pauling) | — |
| State at 20 °C | Unknown (only a few atoms made) |
Where is Tennessine on the periodic table?
Tennessine is in period 7, group 17, in the p-block. The period number matches its 7 electron shells, and the block names the subshell its last electrons fill. In the same group, Astatine sits directly above it. Elements in one group have the same number of outer-shell electrons (7 here), which is why they react in similar ways.
How to work out the electron configuration of Tennessine
Put 117 electrons into subshells in order of rising energy, filling each before starting the next: 1s² (2), 2s² (4), 2p⁶ (10), 3s² (12), 3p⁶ (18), 4s² (20), 3d¹⁰ (30), 4p⁶ (36), 5s² (38), 4d¹⁰ (48), 5p⁶ (54), 6s² (56), 4f¹⁴ (70), 5d¹⁰ (80), 6p⁶ (86), 7s² (88), 5f¹⁴ (102), 6d¹⁰ (112), 7p⁵ (117). In shorthand, [Rn] stands for the 86 electrons of radon, giving [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵.
Frequently asked questions
What is the electron configuration of Tennessine?
The electron configuration of Tennessine (Ts) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p5. In noble-gas shorthand it is written [Rn] 5f14 6d10 7s2 7p5.
How many electrons does Tennessine have in each shell?
Tennessine has 117 electrons arranged in shells as 2, 8, 18, 32, 32, 18, 7. It has 7 electrons in its outer shell.
What is the atomic mass of Tennessine?
Tennessine has no stable isotopes. Its most stable isotope has a mass number of 294.
Is Tennessine a metal?
No. Tennessine is a halogen (predicted).
Explore nearby elements
More halogens: Fluorine, Chlorine, Bromine, Iodine, Astatine. See all elements on the periodic table.