Atoms crossword puzzle (Jaden Williams)

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Across
  1. 3. any one of several types of very small particles that make up matter
  2. 4. any of the forms of an element that differ in the number of neutrons in an atom
  3. 5. the physical substance that everything is made of
  4. 7. one of the stable states of constant energy that may be assumed by a physical system -- used especially of the states of electrons in atoms
  5. 8. the mass of any kind of atom usually expressed in atomic mass units
  6. 12. a number that is characteristic of a chemical element and represents the number of protons in the nucleus
  7. 13. a positively charged ion
  8. 14. an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons
Down
  1. 1. the energy level of a physical system (as an atom) having the least energy of all its possible states
  2. 2. the smallest particle of a substance having all the characteristics of the substance and is composed of one or more atoms
  3. 6. have a negative charge
  4. 9. an atom with a negative charge
  5. 10. have a positive charge
  6. 11. neutral charge
  7. 12. the building block of matter