periodic table

Edit Answers
123456789101112131415161718192021
Across
  1. 1. what has no electrical charge and mass slighlty bigger than a proton
  2. 7. what is the number of protons in the nucleus of an atom
  3. 8. what is found in all atoms and has a negative charge
  4. 9. when two elements react
  5. 11. how many family's are in the periodic table
  6. 13. what is showing a response to a stimulus
  7. 18. what is composed of two or more separate elements
  8. 19. what is principal energy
  9. 20. when was the periodic table discovered
  10. 21. its the what table
Down
  1. 2. what is element or substance that isnt a metal
  2. 3. what are components that arent uniform
  3. 4. what is the mass of a atom
  4. 5. what are reactive metals that do not occur freely in nature
  5. 6. what has a positive charge
  6. 10. the periodic table 118
  7. 12. what are gaseous elements called
  8. 14. what has eightteen numbered groups in the periodic table
  9. 15. elements are made of
  10. 16. who discovered the periodic table Dmitri
  11. 17. what kind of model is a drawing of' elements