Chemistry Crossword

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Across
  1. 3. a pure substance that cannot be broken down into simpler substance
  2. 6. the small positively charged center of the atom
  3. 7. the charge on an ion
  4. 12. a number that describes the relative ability of an atom when bonded to attract electrons
  5. 14. an element that is a good conductor of electricity, malleable, ductile, and lustrous
  6. 16. a circular path in which an electron can move around a nucleus
  7. 17. knowledge coming directly from observations
  8. 18. a positively charged subatomic particle in the nucleus of an atom
  9. 19. any process by which a neutral atom or molecule is converted into an ion
  10. 21. a comprehensive set of ideas that explains a law or a large number of related observations
Down
  1. 1. a mental or physical representation of a theoretical concept
  2. 2. Russian chemist responsible for periodic table
  3. 4. a charged entity formed by the addition or removal or one or more electrons
  4. 5. knowledge based on ideas created to explain observations
  5. 6. an element that is generally a non conductor of electricity and is brittle
  6. 8. another word for base
  7. 9. the smallest particle of an element
  8. 10. used to heat elements and comes out of a burner
  9. 11. acronym for stand ambient temperature and pressure
  10. 13. atoms of an element that have the same number of protons and neutrons
  11. 15. a row in the periodic table
  12. 20. a group of three elements with similar properties