Alkalin/Alkali Earth

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Across
  1. 3. Group 2 of the periodic table.
  2. 5. Second most reactive metal and very soft.
  3. 6. A very soft silvery-white metal.
  4. 8. Atomic number 55.
  5. 11. Red glow in a flame.
  6. 12. Heaviest chemical element.
Down
  1. 1. A naturally occurring radioactive metal.
  2. 2. Atomic number 20.
  3. 4. The lightest structural metals.
  4. 7. Atomic number 19.
  5. 9. Atomic number 56.
  6. 10. A soft, silvery white.