Periodic Table

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Across
  1. 2. Any substance that cannot be broken down in to simpler stable substances by chemical means.
  2. 5. a horizontal row of elements in the periodic table
  3. 6. What is the number of protons in an atom?
  4. 9. The columns on the periodic table
  5. 10. Groups that have 8 electrons are said to be ____?
Down
  1. 1. Found around the nucleus/ where electrons move
  2. 3. The sum of the number of protons and neutrons
  3. 4. How many elements occur naturally on earth?
  4. 7. What is the most abundant element in earth's crust?
  5. 8. What is the smallest unit of an element?