Ch 2 Vocab

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Across
  1. 2. a negatively charged particle in the electron cloud surrounding the atomic nucleus
  2. 7. electron(s) located in outer energy level (electron shell)
  3. 9. smallest particle of an element that maintains the properties of that element
  4. 12. the number of protons in the nucleus of an atom; used to determine an element's position in the Periodic Table
  5. 14. a particle smaller than an atom, such as a proton, neutron, or electron
  6. 17. total number of protons and neutrons in a specific atom
  7. 18. a characteristic of a substance that describes how it combines with other substances to form new ones
  8. 19. a pure substance that cannot be broken down chemically into simpler substances
Down
  1. 1. a conceptual model in which the elements are organized according to their properties; often displayed as a chart
  2. 3. property of matter that can be observed without changing the composition or identity of the matter
  3. 4. the positively charged center of an atom containing the protons and neutrons
  4. 5. a (neutral) particle with no electrical charge within the atomic nucleus
  5. 6. average mass number of all atoms of an element (from particles in the nucleus)
  6. 8. a property of a subatomic particle; positive (protons), negative (electrons), or neutral (neutrons)
  7. 10. the vertical columns on the Periodic Table
  8. 11. a positively charged particle within the atomic nucleus; used to identify an element
  9. 13. the negatively charged space containing electrons that surrounds the atomic nucleus
  10. 15. the horizontal rows on the Periodic Table
  11. 16. tendency of a substance to undergo chemical changes in a system