Oh...isotope =)
Isotopes are variants of a particular chemical element such that, while all isotopes of a given element have the same number of protons in each atom, they differ in neutron number.
Carbon-12 is the more abundant of the two stable isotopes of the element carbon, accounting for 98.89% of carbon; it contains six protons, six neutrons and six electrons. Its abundance is due to the Triple-alpha process by which it is created in stars.
More about triple alpha process:
http://en.wikipedia.org/wiki/Triple-alpha_process
Carbon-12 is of particular importance as it is used as the standard from which atomic masses of all nuclides are measured: its mass number is 12 by definition.
Gif via motionaddicts
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