mass_number¶
-
plasmapy.particles.
mass_number
(isotope: plasmapy.particles.particle_class.Particle) → numbers.Integral¶ Get the mass number (the number of protons and neutrons) of an isotope.
- Parameters
isotope (
str
orParticle
) – A string representing an isotope or a neutron; or an instance of theplasmapy.particles.Particle
class.- Returns
mass_number – The total number of protons plus neutrons in a nuclide.
- Return type
- Raises
InvalidParticleError – If the argument does not correspond to a valid particle.
InvalidIsotopeError – If the argument does not correspond to a valid isotope.
See also
atomic_number
returns the number of protons in an isotope or element
Examples
>>> mass_number("H-1") 1 >>> mass_number("Pb-208") 208 >>> mass_number("tritium") 3 >>> mass_number("alpha") 4