Tennessine
The chemistry of Tennessine is currently unknown. However, chemists can predict what the element would be like using chemistry from the other halogens. Tennessine is most likely supposed to be a member of group 17 in the periodic table, below the five halogens: fluorine, chlorine, bromine, iodine, and astatine. Each of them has seven valence electrons. For tennessine, being in the seventh period (row) of the periodic table, going down the halogen group would predict a valence electron configuration of 7s27p5, and it would therefore be expected to behave kind of like to the halogens in many ways.