to present the oxidation numbers of transition elements according to IUPAC System.
Roman numerals are used to identify the oxidation state of transition metals with more than one possible oxidation state.
The number 8000 can be represented by the Roman numeral VIII with a horizontal bar placed above it or by the Roman numeral [VIII]
The number 100,000 can be represented in Roman numerals by the Roman numeral C with a horizontal bar placed above it or by the Roman numeral [C]
WSS
XHM is not a Roman numeral. There is no Roman numeral with the symbol H and although there are numerals with the symbols X and M, X would never be placed before M in a numeral.
Roman numerals are used to identify the oxidation state of transition metals with more than one possible oxidation state.
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The number 8000 can be represented by the Roman numeral VIII with a horizontal bar placed above it or by the Roman numeral [VIII]
The number 100,000 can be represented in Roman numerals by the Roman numeral C with a horizontal bar placed above it or by the Roman numeral [C]
WSS
A roman numeral in parentheses follows the name of the metal... apex
The number 5000 can be represented by the numeral V with a horizontal bar placed above it or by the numeral [V]
XHM is not a Roman numeral. There is no Roman numeral with the symbol H and although there are numerals with the symbols X and M, X would never be placed before M in a numeral.
Roman Numeral
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The number 93,000,000 written as a Roman numeral would be [XCIII] with a horizontal bar placed above it (which I can't write with my keyboard).
The number 150,000,000 written as a Roman numeral would be [CL] with a horizontal bar placed above it (which I can't write with my keyboard).