1. The atomic number is 6, which represents the number of electrons. It is represented
by the symbol C and is a non-metal.
2. It is formed when a material containing carbon is bumed without enough oxygen for
it to burn completely.
3. It is one of the softest materials known, is a form of carbon that is primarily used as
a lubricant
4. It is an exceptionally important area of chemistry. The majority of chemicals
occurring either naturally or synthetically are organic compounds. Essentially, it is the chemistry of the
element carbon.
5. The third naturally occurring form of carbon is one of the hardest substances known
6. The large molecules consisting only of carbon
7. The fourth allotrope of carbon.
8. A radioactive isotope of carbon with a half-life of 5,730 years, is used to find the age
of formerly living things through a process known as radiocarbon dating
9. This is a behavior exhibited by certain chemical elements: these elements can exist
in two or more different forms known as allotropes of that element
10. The two major allotropes.​