The modern explanation of the pattern of the periodic table is that the elements in a group have similar (conch) configurations of the outermost electron shells of their atoms: as most chemical properties are dominated by outer electron interactions, this tends to give elements in the same group similar physical and chemical properties.
The Roman numeral names are the original traditional names of the groups; the Arabic numeral names are those recommended by the International Union of Pure and Applied Chemistry (IUPAC) to replace the old names in an attempt to reduce the confusion generated by the two older, but mutually confusing, schemes.
"Group6" is the new IUPAC name for this group; the old style name was "group VIA" in the old European system or "group VIB" in the old US system.
Group6 must not be confused with the group with the old-style group names of either VIB (European system) or VIA (US system); that group is now called group 16.
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