matter and energy: atoms, protone, electrons, and the periodic table

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Across
  1. 2. how many hydrogen atoms are in h2o
  2. 4. what element has 84 electrons
  3. 5. what is the symbol of erbium
  4. 6. how many protons are there in the element mercury
  5. 8. how many electrons does astatine have
  6. 10. how many atoms are in c2h4o2
  7. 11. what element is represented by Au
  8. 12. what is the symbol of the second element on the periodic table
  9. 13. how many protons does calcium have
Down
  1. 1. what element has the symbol Ag
  2. 2. how many atoms are in Co2
  3. 3. how many protons and electrons does bismuth have
  4. 7. what is the first element on the periodic table
  5. 9. how many atoms are in hydronium