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Across
  1. 3. a column in the periodic table
  2. 6. sodium carbonate
  3. 8. when same two elements are compared, they have the same amount of protons but different number of neutron
  4. 11. regular arrangement of particles
  5. 12. is a positively charged ion
  6. 13. combining power
  7. 14. a group of non-metals which are unreactive
Down
  1. 1. group 7
  2. 2. substances which don't conduct electricity
  3. 4. the person who first arranged the periodic table
  4. 5. electrons shared unevenly
  5. 7. four hydrogen atoms and one carbon atom
  6. 9. a full outer shell of an atom
  7. 10. most reactive non-metal
  8. 12. the type of bond that forms when atoms share electrons