Physical science summed up

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Across
  1. 4. the graph that shows all the elements
  2. 8. the chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series
  3. 9. how far something was
  4. 12. the chemical element of atomic number 92, a dense gray radioactive metal used as a fuel in nuclear reactors.
  5. 13. how fast something went
Down
  1. 1. something you need to drink in your everyday life
  2. 2. the chemical element of atomic number 5, a nonmetallic solid.
  3. 3. a metallic chemical element of the alkaline-earth group that occurs naturally only in combination and is essential to cellular functions in all known organisms
  4. 5. smallest unit of an element
  5. 6. how much something weighs
  6. 7. the chemical element of atomic number 22, a hard silver-gray metal of the transition series, used in strong, light, corrosion-resistant alloys.
  7. 10. a subject in school
  8. 11. how long something took