If by reactoant you mean reactant then yes it can be a reactant.
C + O2 --> CO2
The reactants (left side) come together and form the products (right side) and the arrow indicates that C + O2 are coming together to form the product CO2.
Carbon is an element, but not carbon dioxide. Carbon dioxide is a compound of carbon and oxygen.
There is proportionally more carbon in carbon monoxide than there is in carbon dioxide. Carbon monoxide, CO, has a one-to-one ration of carbon to oxygen. Carbon dioxide, CO2, has a one-to-two ration of carbon to oxygen.
What is a single carbon-carbon bond
The stable carbon isotopes are carbon-12 & carbon-13. There are several other unstable isotopes.
Carbon 14 is the isotope that is used for carbon dating.
In the carbon cycle, a carbon source releases carbon dioxide into the atmosphere, while a carbon sink absorbs and stores carbon dioxide from the atmosphere.
There are multiple types of carbon atoms (Carbon 12, Carbon 13, and Carbon 14).
Carbon.
The carbon-carbon bonds are covalent.
carbon monixide, carbon dioxide, and plain carbon
carbon Carbon.
The carbon compound with one carbon and two oxygens is carbon dioxide (CO2).