Atoms and elements

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Across
  1. 2. CO2
  2. 4. ... properties can be observed when one substance changes into another
  3. 6. Tiny pieces of matter that cannot be divided
  4. 9. Water split up into 2 gases-... and oxygen
  5. 11. Every element has its own chemical ...
  6. 14. What is the most common metal in the Earth's crust?
  7. 16. There are ... types of elements.
  8. 19. N2
  9. 20. The physical property that causes it to experience a force when placed in an electromagnetic field
  10. 21. The chemical symbol is ... is Cl.
Down
  1. 1. H2O
  2. 3. iron+sulfur
  3. 5. Chemical symbol of mercury is ...
  4. 7. 2 or more atoms joined tightly together
  5. 8. ... properties can be observed with direct observation
  6. 10. What is the most common element in the Earth's crust?
  7. 12. The symbol for this element is O
  8. 13. Some elements are abundant on Earth, others are ...
  9. 15. ... is made up of eight atoms.
  10. 17. Oxygen is made up of ... atoms.
  11. 18. A substance made of only one type of atom