atomic_number¶

plasmapy.atomic.atomic_number(element: plasmapy.atomic.particle_class.Particle) → int¶

Return the number of protons in an atom, isotope, or ion.

Parameters:	element (`str` or `Particle`) – A string representing an element, isotope, or ion; or an instance of the `Particle` class.
Returns:	atomic_number – The atomic number of an element.
Return type:	`int`
Raises:	`InvalidElementError` – If the argument is a valid particle but not a valid element. `InvalidParticleError` – If the argument does not correspond to a valid particle. `TypeError` – If the argument is not a `str`.

See also

mass_number : returns the mass number (the total: number of protons and neutrons) of an isotope.

Examples

>>> atomic_number("H")
1
>>> atomic_number("tritium")
1
>>> atomic_number("alpha")
2
>>> atomic_number("oganesson")
118