Science study guide

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Across
  1. 3. sets of electrons in a ring
  2. 6. matter cannot be created or destroyed
  3. 8. an element with properties of both metals and nonmetals
  4. 9. the substance in a chemical reaction that's changed
  5. 10. takes in heat
  6. 11. releases heat
  7. 13. a numbering of the electrons/protons an element has
  8. 15. particle with a negative charge
  9. 16. a set of different atoms mixed together
  10. 18. a certain type of matter with unique properties
  11. 19. the core of an atom, storing protons and neutrons
  12. 20. an element with poor conductivity and malleability
  13. 22. particle with a positive charge
  14. 23. a column on the periodic table
Down
  1. 1. an element with a full valence orbital
  2. 2. covering one element with another
  3. 4. something created by a chemical reaction
  4. 5. man who created the periodic table
  5. 7. an electron on the outermost orbital
  6. 12. an abbreviation for the name of an element
  7. 13. the mass of an element
  8. 14. an element with high conductivity and malleability
  9. 17. particle with no charge
  10. 21. small unite of matter with the properties of a certain element
  11. 22. a row on the periodic table