Group: Noble gases
Noble gases (8th main group) are monoatomic, colorless and odorless gases under normal conditions. In noble gases, all electron shells are either completely filled with electrons or empty. Therefore, this state is also called noble gas configuration.
2HeHeliumcolorless gas, exhibiting a gray, cloudy glow 10NeNeoncolorless gas exhibiting an orange-red glow when placed in an electric field 18ArArgoncolorless gas exhibiting a lilac/violet glow when placed in an electric field 36KrKryptoncolorless gas, exhibiting a whitish glow in an electric field 54XeXenoncolorless gas, exhibiting a blue glow when placed in an electric field