Science Vocab Crossword

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Across
  1. 2. the horizontal rows on the Periodic Table
  2. 5. a positively charged particle within the atomic nucleus
  3. 6. total number of protons and neutrons in a specific atom
  4. 7. a negatively charged particle in the electron cloud
  5. 11. their properties
  6. 12. the number of protons in the nucleus of an atom
  7. 15. property of matter that can be observed
  8. 16. tendency of a substance to undergo chemical changes
  9. 17. a (neutral) particle with no electrical charge
  10. 19. a particle smaller than an atom, such as a proton, neutron, or electron
  11. 20. a conceptual model in which the elements are organized according
Down
  1. 1. a property of a subatomic particle
  2. 3. electrons located in outer energy level
  3. 4. the vertical columns on the Periodic Table
  4. 8. a characteristic of a substance
  5. 9. average mass number of all atoms
  6. 10. smallest particle of an element
  7. 13. a pure substance that cannot be broken down
  8. 14. the negatively charged space containing electrons
  9. 18. the positively charged center of an atom