Tennessine is a synthetic element with the symbol Ts and atomic number 117. It is classified as a halogen, which places it in the same group as fluorine, chlorine, bromine, iodine, and astatine. Discovered in 2010, Tennessine was named in honor of the state of Tennessee and is produced in particle accelerators through the fusion of lighter elements. Due to its short half-life, Tennessine is highly unstable and has only been produced in minute quantities. Its most stable isotope, Ts-294, has a half-life of about 20 milliseconds. As a result, there is limited information about its chemical properties, but it is expected to exhibit characteristics similar to those of astatine.