Label each element as requiring roman numerals when named in an ionic compound or not requiring roman numerals, Na
does not need roman numeral in name
Cu
Mg
111111
Mn
Ni
Cs
needs roman numeral in name
!! does not need roman numeral in name

yes

explanation:

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because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.