old_contents: """Physical and mathematical constants for use within PlasmaPy."""
  from .atomic import atomic_symbol, isotope_symbol, atomic_number, is_isotope_stable, half_life, mass_number, element_name, standard_atomic_weight, isotope_mass, ion_mass, known_isotopes, common_isotopes, stable_isotopes, isotopic_abundance, charge_state, electric_charge
  from .nuclear import nuclear_binding_energy, nuclear_reaction_energy
  from .elements import atomic_symbols, atomic_symbols_dict, Elements
  from .isotopes import Iso
  
new_contents: """Physical and mathematical constants for use within PlasmaPy."""
  from .atomic import (atomic_symbol,
                       isotope_symbol,
                       atomic_number,
                       is_isotope_stable,
                       half_life,
                       mass_number,
                       element_name,
                       standard_atomic_weight,
                       isotope_mass,
                       ion_mass,
                       known_isotopes,
                       common_isotopes,
                       stable_isotopes,
                       isotopic_abundance,
                       charge_state,
                       electric_charge)
  
  from .nuclear import nuclear_binding_energy, nuclear_reaction_energy
  
subject: Update atomic/__init__.py