periodic table

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Across
  1. 2. what are gaseous elements called
  2. 4. what has no electrical charge and mass slighlty bigger than a proton
  3. 9. when two elements react
  4. 11. how many family's are in the periodic table
  5. 12. what has a positive charge
  6. 15. what is principal energy
  7. 16. when was the periodic table discovered
  8. 17. who discovered the periodic table Dmitri
  9. 19. elements are made of
Down
  1. 1. what is composed of two or more separate elements
  2. 3. what is the mass of a atom
  3. 5. what are components that arent uniform
  4. 6. what has eightteen numbered groups in the periodic table
  5. 7. what is showing a response to a stimulus
  6. 8. what kind of model is a drawing of' elements
  7. 10. what is the number of protons in the nucleus of an atom
  8. 12. its the what table
  9. 13. the periodic table 118
  10. 14. what is element or substance that isnt a metal
  11. 18. what is found in all atoms and has a negative charge