Chemistry Crossword

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Across
  1. 1. a positive charge
  2. 2. on the periodic table, vertical column down
  3. 4. clump of protons and neutrons, in the middle of an atom
  4. 5. the smallest component of a chemical
  5. 8. a neutral charge
  6. 11. an isolated system is neither created nor destroyed by chemical reactions
  7. 15. brittle, not malleable, not a good conductor of electricity
  8. 16. circle of electrons around the nucleus (2,8,8,2)
  9. 17. mass of an element
  10. 18. the two letters to represent the element
  11. 20. substance made of 2+ different kinds of atoms
  12. 21. made the first periodic table
  13. 23. does not mix with other elements, neon & helium are examples
  14. 25. energy is absorbed, cool
Down
  1. 1. what comes out of a chemical reaction
  2. 3. a negative charge
  3. 6. good conductor of electricity, malleable
  4. 7. reaction when a layer of metal is bonded to another substance, typically another metal
  5. 9. on the periodic table, horizontal rows across
  6. 10. energy is released, heat
  7. 12. outer circle of of electrons
  8. 13. number of protons and neutrons in the nucleus
  9. 14. pure subastance, periodic table
  10. 19. mix between metal and non-metal
  11. 22. combination of atoms together
  12. 24. what you out into a chemical reaction