Science Crossword

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Across
  1. 3. the 7th element of the periodic table
  2. 7. the planet on which we live; the world.
  3. 8. the 1st element on the periodic table
  4. 9. The 8th element on the periodic table
Down
  1. 1. The envelope of gases surrounding the earth
  2. 2. The emission of energy as electromagnetic waves or as moving subatomic particles
  3. 4. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
  4. 5. the 3rd element on the periodic table
  5. 6. The 6th element of the periodic table
  6. 7. the property of matter and radiation which is manifest as a capacity to perform work