# ""^12C, ""^13C, and ""^14C contain HOW many protons, and how many neutrons?

""^12C, ""^13C, and ""^14C ARE ALL elemental carbon. Because each isotope has $\text{6 protons}$, $6$ positively charged, massive nuclear protons, and different numbers of neutrons. That $Z = 6$ is what defines the species as $\text{carbon}$.
Of course, on the Periodic Table, we see a mass of $12.011 \cdot g \cdot m o {l}^{-} 1$ listed for $C$. This is the weighted average of the individual carbon isotopes. As $Z$ increases, the number of possible isotopes tends to increase, and elements with higher $Z$ tend to have fractional atomic masses.