Chemistry Unit

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Across
  1. 2. smallest particle in a substance
  2. 5. negative electrical charge
  3. 8. element not having a metal character
  4. 10. top to bottom on a Periodic Table
  5. 11. any closed system subjected to no external forces, the mass is constant irrespective of its changes in form
  6. 15. gives off heat and energy
  7. 16. a substance changes when combined with other substances in a chemical reaction
  8. 17. group of rare gases
  9. 18. center part of an atom with protons and neutrons
  10. 19. one or more atoms of the same substance
  11. 20. represents the element
  12. 21. absorbs energy and is cold
  13. 23. substance that is a conductor of heat and electricity
  14. 24. substance obtained from another substance through chemical change
Down
  1. 1. amount of orbitals on the outer shell of an atom
  2. 3. positive electrical charge
  3. 4. no electrical charge
  4. 6. an external layer of metal
  5. 7. Russian chemist and formed the Periodic law
  6. 9. combining two or more substances
  7. 12. represents the number of protons and electrons
  8. 13. mass of a given element
  9. 14. properties between metals and nonmetals
  10. 21. one substance made from atoms
  11. 22. goes around the nucleus of an atom
  12. 24. left to right on a Periodic Table