That one is Ununoctium, and is believed to be relatively reactive.
The first was not discovered until 1868, and one that's assumed to exist has yet to be discovered. That one is Ununoctium, and is believed to be relatively reactive. This would set it apart from most of the others, as their complete valence shells limit their reactivity. Most commonly, these members of group 18 are used in lighting fixtures. FTP, name this group on the far right-hand side of the periodic table of elements which includes Krypton and Helium.
The first was not discovered until 1868, and one that's assumed to exist has yet to be discovered.
{Noble} gases