The Roman numeral L = 50. There is no LL in Roman numerals.
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There is no direct equivalent for "ll" in the Roman numeral system. The Roman numeral for 50 is "L". Therefore, the expression "x - ll" would be "x - 50" in Roman numerals. If you meant to use "ll" as an abbreviation for 2, the expression "x - ll" would be written as "x - 2" in Roman numerals.
XX represents 20, because X = 10 and XX simply = 10 + 10. L represents 50 but LL would never be used because it would equal 100 and there is already an existing numeral for 100, which is C.
the answer to what is the roman numeral for 101 is CI
XXV is the Roman Numeral for 25
The Roman numeral following the cation tells you the oxidation number of that cation. For example, Cu(ll)chloride tags you it is CuCl2 because the (ll) after Cu indicates an ox. no. of 2+.