The Atom/Isotopes and Radioactive Decay

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Across
  1. 3. an atom that has a positive or negative charge
  2. 4. ionizing radiation that is made up of a helium particle
  3. 6. The ______ of neutrons to protons determines the stability of nucleus
  4. 7. ______number is equal to number of protons
  5. 9. number of neutrons in Nitrogen-15
  6. 11. time required for 50% of a radioisotope to decay(2 words)
  7. 12. positive charged and located in the nucleus
  8. 15. unstable atoms caused by neutron/proton ratio
  9. 16. found in the nucleus of atoms but have no charge
  10. 17. _______ number the sum of protons and neutrons
Down
  1. 1. describes the percentage of an isotope that exists in nature for an element
  2. 2. type of ionizing radiation that is NOT a particle
  3. 5. atoms of same element that have different number of neutrons
  4. 8. _____ particle is a negative charged form of ionizing radiation
  5. 10. much lighter in mass than protons or neutrons
  6. 13. element that has 26 protons in any isotope
  7. 14. radioactive/nuclear______ is process when the nucleus of an atom releases ionizing