About

Tennessine is a synthetic super-heavy element named to honor the state of Tennessee, home to several key research laboratories like Oak Ridge National Laboratory. As a member of group 17, it is predicted to be a halogen, though its properties may differ significantly from lighter halogens, possibly exhibiting more metallic character. It is the second-heaviest element created to date.

Atomic Properties

Atomic Number117

Atomic Weight294 u

Neutrons (common)177

Electron Configuration[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

Full Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰ 7p⁵

Electrons per Shell2, 8, 18, 32, 32, 18, 7

Electron Affinity165.9 kJ/mol

Oxidation States-1, +1, +3, +5

Covalent Radius165 pm

Periodic Table Position

Group17

Period7

BlockP

Chemical SeriesHalogens

Physical Properties

State at STPsolid

Thermal Properties

Melting Point723 K

Boiling Point883 K

Heat of Fusion20 kJ/mol

Heat of Vaporization60 kJ/mol

Discovery

Discovered byJoint Institute for Nuclear Research, Lawrence Livermore National Laboratory, Oak Ridge National Laboratory

Discovery Year2,010

Occurrencesynthetic

CAS Number87658-56-8

Electron Configuration

Energy

↿⇂

1s

↿⇂

2s

↿⇂

2p

↿⇂

3s

↿⇂

3p

↿⇂

4s

↿⇂

3d

↿⇂

4p

↿⇂

5s

↿⇂

4d

↿⇂

5p

↿⇂

6s

↿⇂

4f

↿⇂

5d

↿⇂

6p

↿⇂

7s

↿⇂

5f

↿⇂

6d

↿⇂

↿

7p

Isotopes of Tennessine

Symbol ▲	Mass (u) ▲	Abundance ▲	Half-life ▲	Decay Mode ▲
²⁹⁴Ts	294.210460	—	70 ms	Alpha Decay