Creative Chemistry

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Across
  1. 5. atoms with different masses
  2. 6. core of atom
  3. 8. negative charge
  4. 12. top number on any element
  5. 13. an unstable nuclei
  6. 16. a positively charged ion
  7. 17. metallic
  8. 18. neutral charge
Down
  1. 1. mass,density,color
  2. 2. a property made of two elements
  3. 3. arrangement of electrons
  4. 4. positive charge
  5. 7. iron,neon
  6. 9. substance changes composition
  7. 10. electron shells
  8. 11. bottom number on any element
  9. 14. a negatively charged ion
  10. 15. basic chemical unit