 Unlike the previous group 17 elements, tennessine may not exhibit the chemical behavior common to the halogens.For example, fluorine, chlorine, bromine, and iodine routinely accept an electron to achieve the more stable electronic configuration of a noble gas, obtaining eight electrons (octet) in their valence shells instead of seven.This ability weakens as atomic weight increases going down the group; tennessine would be the least willing group 17 element to accept an electron.