parts of atom

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Across
  1. 3. center of a atom
  2. 6. Principal energy level of an electron in an atom, often visualised as an orbit
  3. 7. making one isotope split another or many isotope
  4. 9. a particle with positive charge
  5. 11. group 3-12
  6. 12. As knowledge of nuclear physics increased this term was needed to describe an atom of the same element with a different number of neutrons
  7. 14. first group
Down
  1. 1. second group
  2. 2. group 17
  3. 4. making two isotope into one
  4. 5. the weight of all things in a atom
  5. 8. a table detailing each element
  6. 10. particle with no charge
  7. 13. subatomic partical with positive charge
  8. 14. a type of molecule made from protons,nutrons and electrons