Nuclear energy

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Across
  1. 2. the emission of ionizing radiation
  2. 3. the overall weight of the nucleus in an atom
  3. 7. weightless packets of energy called photons
  4. 10. The time it takes for half of something to decay
  5. 11. the positively charged central core of an atom
  6. 13. atoms with the same number of protons and electrons, but a different number of neutrons
Down
  1. 1. One thing happens which causes multiple other things to happen
  2. 4. the number that represents protons and nuetrons on the periodic table
  3. 5. two protons and two neutrons tightly bound together
  4. 6. Beta particles have a mass which is half of one thousandth of the mass of a proton and carry either a single negative (electron) or positive (positron) charge
  5. 8. a heavy nucleus splits spontaneously
  6. 9. a proton but without an electric charge
  7. 12. a particle in the nucleus with a positive charge