Periodic Table

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Across
  1. 6. The number of protons in an atom
  2. 7. An atom of an element that has an electric charge
  3. 8. The mass of an atom; equal to protons plus neutrons
  4. 9. The electrons found in the outermost shell
  5. 10. The name of the element
Down
  1. 1. A string of element symbols that tell what a molecule is made of
  2. 2. A group of two or more elements bonded together
  3. 3. The letter or pair of letters that stand(s) for an element
  4. 4. Made up of only one type of atom
  5. 5. The smallest particle of any element that retains the properties of the element