Periodic Table

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12345678910111213141516171819
Across
  1. 3. an element with an atomic mass of 30.9
  2. 8. an element with the symbol Be
  3. 9. an element with an atomic number of 14
  4. 10. an element with 8 electrons
  5. 11. the third most abundant gas in Earth's atmosphere
  6. 15. an element in period 3 and group 2
  7. 17. an element with 17 electrons
  8. 18. an element with 5 protons
  9. 19. an element most commonly found in the Earth's crust as limestone
Down
  1. 1. an element with the symbol K
  2. 2. an element with one electron
  3. 4. an element with commonly two neutrons
  4. 5. an element with the symbol Na
  5. 6. an element in group 1 with commonly 3 neutrons
  6. 7. an element in period 2 and group 17
  7. 11. an element in period 3 and group 13
  8. 12. an element with commonly 10 neutrons
  9. 13. an element with 14 protons
  10. 14. when combined with hydrogen, produces a rotten egg smell
  11. 16. an element with an atomic mass of 14.0067