Because:
1. Carbon monoxide (CO) has one atom of oxygen in the molecule.
2. Carbon dioxide (CO2) has two atoms of oxygen in the molecule.
CO and CO2 are different chemical compounds.
The correct name for CCl4 is carbon tetrachloride.
Carbon Dioxide is a compound and thus does not have an element name
The systematic name for carbon dioxide is carbon(IV) oxide.
The traditional name for PbO2 is lead dioxide.
CO2 is the chemical formula of carbon dioxide.
The correct name for CCl4 is carbon tetrachloride.
The names in order are: nitrogen dioxide or mononitrogen dioxide; iodic acid; carbon disulfide or monocarbon disulfide; and hydrogen fluoride, which if dissolved in water is more often called hydrofluoric acid.
No prefix is used if it is an ionic compound. If it is a binary molecular compound, the prefix mono- is not used in front of the name of the first element. For example, the ionic compound Na2O is sodium oxide, not disodium monoxide, and the molecular compound CO2 is carbon dioxide, not monocarbon dioxide.
IUPAC names; Tetraiodomethane or Carbon tetraiodide.Common name; Carbon tetraiodide.
H2O2 is a common name for hydrogen dioxide
Uranium dioxide
The common name of sulfur dioxide is sulfurous acid.
Sulfur dioxide
Nitrogen dioxide
The molecular compound name for SO2 is sulfur dioxide.
Sulfur Dioxide is the common name for SO3.
Lead Dioxide or Lead IV Oxide