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