Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Carbon-12 is the more abundant of the two stable isotopes of the element carbon, accounting for 98.89% of carbon; it contains 6 protons, 6 neutrons, and 6 electrons. 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 by definition 12.

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