The Periodic Table

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Across
  1. 4. What element has atomic number 1?
  2. 5. What is the compound that consists of hydrogen and oxygen?
  3. 7. What are the horizontal rows in the periodic table called?
Down
  1. 1. What element has the symbol O?
  2. 2. What element has the symbol Fe?
  3. 3. Who is the Russian scientist who made the modern periodic table?
  4. 6. What is Gold’s element symbol?