The Structure of the Atom

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Across
  1. 5. ray of radiation traveling from the cathode to the anode (2 wds)
  2. 9. high energy radiation that has no charge and no mass (2 wds)
  3. 10. atoms with the same number of protons but different numbers of neutrons
  4. 11. states that all matter is composed of atoms (no apostrophe, 3 wds)
  5. 12. the smallest particle of an element that retains the properties of that element
  6. 13. radiation deflected toward the positively charged plate (2 wds)
Down
  1. 1. process whereby some substances spontaneously emit radiation
  2. 2. the center-most part of the atom where the protons & neutrons are contained
  3. 3. radiation deflected toward the negatively charged poles (2 wds)
  4. 4. process (not requiring energy) by which unstable nuclei lose energy (no apostrophe,2 wds)
  5. 6. the weighted average mass of an element's isotopes (2 wds)
  6. 7. the rays & particles emitted by radioactive material
  7. 8. equal to 1/2 the mass of a carbon-12 atom (3 wds)