High Quality Content by WIKIPEDIA articles! A Group 6 element is one in the series of elements in group 6 (IUPAC style) in the periodic table, which consists of the transition metals chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg). The period 8 elements of group 6 are likely to be either unpenthexium (Uph) or unpentoctium (Upo)(if possible, since drip instabilities may imply that the periodic table ends at unbihexium). Neither of them have been synthesized, and it is unlikely that this will happen in the near future.