Atoms and elements

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