12c denotes that element carbon has mass number of 6 and atomic
number 12.
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Mass Number(A) = Number of Protons + Number of Neutrons
The element carbon (C) has an atomic number of 6, which means that all neutral carbon atoms contain 6 protons and 6 electrons. In a typical sample of carbon-containing material, 98.89% of the carbon atoms also contain 6 neutrons, so each has a mass number of 12.2
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