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What covalent compound is SCl4?
##"SCl"""_4## is sulfur tetrachloride.
are named using two words:
The first word is the name of the first element in the compound. If there is more than one of them, you use a prefix such as di-, tri-, tetra-, and so forth to indicate how many there are.
The second word is the name of the second element in the compound with "-ide" tacked onto the end. If there is more than one of them, you use the prefixes I mentioned above. One difference: If there is only one oxygen atom, you say "monoxide" to tell people about that.
In your example, there is one sulfur atom (sulfur) and four chlorine atoms (tetrachloride). Your answer: sulfur tetrachloride.
Some such as acids, organic compounds, and very common materials use different naming systems. However, unless you're working on those right now, don't sweat it!