What does the Roman numeral above the group tell us about the structure of the atom?

What does the Roman numeral above the group tell us about the structure of the atom?
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If you are referring to GROUP NUMBER when you say "Roman numeralabove the group", it tells you the number of valence electrons, orthe number of outermost electrons, with transition metals being theexception. For group number XII - XVIII the number of valenceelectrons is the group number minus 10 (minus 10 for the 10transition groups).
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