The Atom

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Across
  1. 2. The ability on an element to attract electrons in a compound
  2. 3. Protium(H-1) and Tritium(H-3) are examples of Hydrogen's ______
  3. 6. Who used the scientific method to revise Democritus's model of the atom?
  4. 10. The rows that correspond to the number of energy levels
  5. 14. Contains neutrons and protons
  6. 15. Electrons, protons, and neutrons are all ______
  7. 18. What forces hold the nucleus together?
  8. 20. Nuclear ______ is when particles and rays emit from an unstable nucleus
  9. 21. The total numbers of protons and neutrons in the nucleus
Down
  1. 1. The space where electrons are most likely to be found
  2. 4. Atomic _____ is the region of space where there is a high probability of finding an electron
  3. 5. ____ levels represent fixed energies of an electron
  4. 7. What identifies an element?
  5. 8. The ____ table arranges elements into groups based on repeating properting
  6. 9. The columns that have similar chemical and physical properties
  7. 11. What is the distance between crests?
  8. 12. ____ is the time required for one-half of the nuclei in a radioisotope to decay
  9. 13. What is it called when an atom emits a helium nuclei?
  10. 16. What is the smallest particle of an element?
  11. 17. The energy required to move an electron from one energy level to the next
  12. 19. Light consists of _____