Functions that retrieve or are related to elemental or isotopic data.


atomic_number(element) Return the number of protons in an atom, isotope, or ion.
common_isotopes(argument, …) Return a list of isotopes of an element with an isotopic abundances greater than zero, or if no input is provided, a list of all such isotopes for every element.
electric_charge(particle) Return the electric charge (in coulombs) of a particle.
half_life(particle, mass_numb) Return the half-life in seconds for unstable isotopes and particles, and numpy.inf in seconds for stable isotopes and particles.
integer_charge(particle) Return the integer charge of a particle.
is_stable(particle, mass_numb) Return True for stable isotopes and particles and False for unstable isotopes.
isotopic_abundance(isotope, mass_numb) Return the isotopic abundances if known, and otherwise zero.
known_isotopes(argument, …) Return a list of all known isotopes of an element, or a list of all known isotopes of every element if no input is provided.
mass_number(isotope) Get the mass number (the number of protons and neutrons) of an isotope.
particle_mass(particle, *, Z, mass_numb) Return the mass of a particle.
periodic_table_block(argument, numbers.Integral]) Return the periodic table block.
periodic_table_category(argument, …) Return the periodic table category.
periodic_table_group(argument, numbers.Integral]) Return the periodic table group.
periodic_table_period(argument, …) Return the periodic table period.
reduced_mass(test_particle, target_particle) Find the reduced mass between two particles.
stable_isotopes(argument, …) Return a list of all stable isotopes of an element, or if no input is provided, a list of all such isotopes for every element.
standard_atomic_weight(element) Return the standard (conventional) atomic weight of an element based on the relative abundances of isotopes in terrestrial environments.