Chemistry: Periodic Table

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Across
  1. 3. found in the nucleus and has a neutral charge
  2. 7. tendency for a chemical substance to undergo a chemical reaction
  3. 8. where electrons are found
  4. 11. the center of an atom where protons and neutrons may be found
  5. 12. a positive subatomic particle
  6. 13. negatively charged particle
  7. 15. the smallest particle of an element with all the properties of that element
  8. 16. a model of an atom where electrons travel in circular pathways around the nucleus
  9. 17. zero charge
  10. 19. a property of a substance that cannot be observed without changing the identity of the substance
Down
  1. 1. the number of protons in the atom
  2. 2. a property of a substance that can be observed without changing the identity of the substance
  3. 4. a table organizing all the known elements based on electron shells, the number of valence electrons, and the number of protons
  4. 5. electrons in the outermost shell
  5. 6. a column on the periodic table
  6. 9. a pure substance made of only one type of atom
  7. 10. the father of the periodic table
  8. 14. the combined mass of the protons and the neutrons of an atom
  9. 18. a row on the periodic table