Tennessine (Ts) is a chemical element with atomic number 117. It is the second heaviest known element, and it's the second to last element in the periodic table. It is named after the US State of Tennessee.

Tennessine is a synthetic element with very short half-life. Since it is expensive to produce and since it decays within milliseconds, its chemical properties have not been fully investigated.

Tennessine can be spelled using chemical element symbols: Te - N - Ne - S - Si - Ne.