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CHEM! Why do we use roman numerals (aka stock system) when you write the name for a compound with (example:) tin in it even though it’s a main group metal?

User Percebus
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Roman numerals are used in naming ionic compounds when the metal cation forms more than one ion. The metals that form more than one ion are the transition metals, although not all of them do this.

SnBr2 - Tin(II) Bromide


User Edder
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