periodic table

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Across
  1. 3. (Radon - Rn... wait, let's use: Radium, Oxygen, Nitrogen - Ra, O, N)
  2. 5. (Barium, Nitrogen - Ba, N).
  3. 6. (Thorium, Iodine, Nitrogen, Potassium - Th, I, N, K).
  4. 8. (Silicon, Lanthanum, Nitrogen, Tellurium - or Si, Le, N, T).
  5. 10. (Cobalt, Aluminum - Co, Al).
Down
  1. 1. (Germanium, Nickel, Uranium, Sulfur - Ge, Ni, U, S).
  2. 2. (Barium, Cobalt, Nitrogen - Ba, Co, N).
  3. 4. (Phosphorus, Actinium, Neon, Einsteinium - P, A, Ne, E).
  4. 7. (Helium, Lithium - He, Li, M).
  5. 9. (Cobalt, Fluorine, Fermium - or simply C, O, F, Fe, E).