Chemistry › Isotope
Mendeleev · Isotope
Carbon-13
Carbon-13: atomic number 6, mass number 13, with 6 protons and 7 neutrons.
IsotopeC
136C
Protons6
Neutrons7
Electrons (neutral)6
The proton count fixes the element: 6 protons identify Carbon. Mass number 13 is the total number of protons and neutrons.
A neutral Carbon-13 atom also has 6 electrons. Changing neutrons changes the isotope; changing electrons changes the charge.