Final answer:
The student's question involves naming compounds containing transition metals. Names must include the charge of the metal ion, indicated by a Roman numeral. Examples include Lead(II) oxide for PbO and Manganese(II) chloride for MnCl2.
Step-by-step explanation:
The student's question relates to the naming of chemical compounds with transition metals. Transition metals can form ions with different charges making their naming slightly more complex. To correctly name these compounds, one must include the charge of the metal ion in the name of the compound.
- A. Pb2O - Lead(II) oxide
- B. MnCl2 - Manganese(II) chloride
- C. CoS2N - This formula appears incorrect, but if meant to be cobalt(III) sulfide, it would be Co2S3
- D. CrCl3 - Chromium(III) chloride
When naming compounds with transition metals like lead(II) and manganese(II), the Roman numeral indicates the oxidation state of the metal.