old_contents: """Physical and mathematical constants for use within PlasmaPy."""
  
  from .special_particles import ParticleZoo
  
  from .particle_class import Particle
  from .particle_input import particle_input
  
  from .symbols import (
      atomic_symbol,
      isotope_symbol,
      ion_symbol,
      particle_symbol,
      element_name,
  )
  
  from .atomic import (
      atomic_number,
      is_stable,
      half_life,
      mass_number,
      standard_atomic_weight,
      isotope_mass,
      ion_mass,
      particle_mass,
      known_isotopes,
      common_isotopes,
      stable_isotopes,
      isotopic_abundance,
      integer_charge,
      electric_charge,
      reduced_mass,
  )
  
  from .nuclear import (
      nuclear_binding_energy,
      nuclear_reaction_energy,
  )
  
new_contents: """
  The `plasmapy.atomic` subpackage provides access to information about
  atoms, isotopes, ions, and other particles.
  """
  
  from .special_particles import ParticleZoo
  
  from .particle_class import Particle
  from .particle_input import particle_input
  
  from .symbols import (
      atomic_symbol,
      isotope_symbol,
      ion_symbol,
      particle_symbol,
      element_name,
  )
  
  from .atomic import (
      atomic_number,
      is_stable,
      half_life,
      mass_number,
      standard_atomic_weight,
      isotope_mass,
      ion_mass,
      particle_mass,
      known_isotopes,
      common_isotopes,
      stable_isotopes,
      isotopic_abundance,
      integer_charge,
      electric_charge,
      reduced_mass,
  )
  
  from .nuclear import (
      nuclear_binding_energy,
      nuclear_reaction_energy,
  )
  
subject: Revise overview docstring in atomic/__init__.py