old_contents: """Physical and mathematical constants for use within PlasmaPy"""
  from .atomic import (atomic_symbol, isotope_symbol, atomic_number,
                       mass_number, element_name, standard_atomic_weight,
                       isotope_mass, ion_mass, half_life, is_isotope_stable,
                       known_isotopes, common_isotopes, stable_isotopes,
                       isotopic_abundance, charge_state)
  
  from .nuclear import (nuclear_binding_energy, nuclear_reaction_energy)
  
  from .elements import Elements
  
  from .isotopes import Isotopes
  
new_contents: """Physical and mathematical constants for use within PlasmaPy"""
  from .atomic import (atomic_symbol, isotope_symbol, atomic_number,
                       mass_number, element_name, standard_atomic_weight,
                       isotope_mass, ion_mass, half_life, is_isotope_stable,
                       known_isotopes, common_isotopes, stable_isotopes,
                       isotopic_abundance, charge_state, electric_charge)
  
  from .nuclear import (nuclear_binding_energy, nuclear_reaction_energy)
  
  from .elements import Elements
  
  from .isotopes import Isotopes
  
subject: Fix visibility of atomic.electric_charge