Periodic Table

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Across
  1. 3. Elemental symbol is K
  2. 6. Period 2 of the Alkali metals
  3. 8. The most radioactive el element in group 1
  4. 10. Odorless, invisible, radioactive gas with 86 protons
  5. 11. Atomic number 24
  6. 14. Occurs in trace amounts of earth's atmosphere, with symbol Kr
  7. 16. Atomic mass of 47.867
  8. 17. Heaviest stable halogen, with an amu of 126.904
  9. 18. period 3 of the fluorine family
  10. 20. An oxidizing agent, with an atomic number of 8
Down
  1. 1. 3rd most abundant metal in earth’s crust, symbol is Ca
  2. 2. A bright, yellow solid at room temperature, with 16 protons
  3. 4. Very important mineral in your body, atomic number of 26
  4. 5. 5 neutrons
  5. 7. A soft, malleable basic metal, with an atomic number of 50
  6. 9. A noble gas with symbol At
  7. 12. The lightest element
  8. 13. Atomic mass of 24.305
  9. 15. Element with the atomic number 29
  10. 19. Symbol is Ne