An atom's identity and isotope come down to three numbers: the atomic number (protons), the number of neutrons, and the mass number (protons + neutrons combined).
An atom's identity and isotope come down to three numbers: the atomic number (protons), the number of neutrons, and the mass number (protons + neutrons combined). This calculator finds any one of the three from the other two.
A carbon-14 atom has atomic number 6 and mass number 14. Leaving Neutrons blank: Neutrons = 14 − 6 = 8.
The total count of protons and neutrons in an atom's nucleus, representing a specific isotope.
Mass number = protons + neutrons.
Atomic number is just proton count; mass number includes protons and neutrons.