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
  from .particles import *
  
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
  from .elements import atomic_symbols, atomic_symbols_dict, Elements
  from .isotopes import Iso
  
subject: remove star import from particles.py