Element Class

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Across
  1. 2. An element discovered by Marie Curie which is an alkaline metal
  2. 3. Atomic mass is equal to five times five-one point eight-two-zero-two
  3. 6. Atomic number P-B
  4. 7. Initials are Z-N
  5. 8. Ninety-eight protons and one-hundred-fifty-three neutrons
  6. 10. Atomic mass of one-zero-six point four-two
  7. 13. Initials of T-M
  8. 16. How old was Marguerite Perey when she discovered francium
  9. 17. Atomic mass of one-five-eight point nine-two-five
  10. 19. How many valence electrons does actinium have
  11. 21. A key part of salt
  12. 24. Fifty-two protons and seventy-six neutrons
  13. 26. A metal in the halogen family
  14. 28. Total amount of elements that are metals
  15. 31. A metal which is liquid at room temperature
  16. 32. An element named after the first woman in Germany to become a physics professor
  17. 33. Atomic mass of two-zero-four point three-eight-three
  18. 35. Initials of H-E
  19. 36. A metalloid in period two
  20. 37. A metal with one-hundred-twenty-five neutrons
Down
  1. 1. Forty-six protons and sixty neutrons
  2. 4. An element discovered by Lecoq de Boisbaudran in one-eight-seven-five
  3. 5. How many neutrons does copernicium have
  4. 9. When was indium discovered
  5. 11. Atomic mass of one-four point zero-zero-seven
  6. 12. Named after America
  7. 14. An element with the atomic mass of ninety-eight
  8. 15. A deadly poison
  9. 18. The most common metal
  10. 20. Alkaline metal in period two
  11. 22. A noble gas with eight valence electrons
  12. 23. Initials are C-O
  13. 25. Element with the atomic number of fifty-seven
  14. 27. Atomic number of sixty-two
  15. 29. Atomic number seventy-seven
  16. 30. A metalloid in period three
  17. 34. Atomic number is equal to the square root of one-zero-two-zero-one