Unit 1 Vocabulary

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