atomic_number

plasmapy.particles.atomic.atomic_number(

element: str | int | integer | Particle | CustomParticle | Quantity,

) → int

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

Parameters:

element (atom-like) – A string representing an element, isotope, or ion; or an instance of the Particle class.

Returns:

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.

See also

mass_number

Examples

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