Elements, atoms, and compounds

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Across
  1. 2. Two or more elements chemically bonded together
  2. 4. An element with the symbol O
  3. 6. An element with the symbol C
  4. 7. The smallest part of an element that can
  5. 9. There are 118 of these
Down
  1. 1. An element with the symbol H
  2. 3. This lists all the known elements in a table
  3. 5. An element with the symbol N
  4. 8. The second element on the periodic table