Periodic Table

1234567
Across
  1. 2. First element discovered
  2. 5. Element with the atomic number 12
  3. 7. Element with the atomic symbol 'Na'
Down
  1. 1. Element with the atomic weight 1.0079
  2. 3. Element with the atomic symbol 'K'
  3. 4. The 100th element
  4. 6. Element with the atomic number 79