Elements

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Across
  1. 2. number of protons in an atom
  2. 7. a column in the periodic table
  3. 9. the organized array of all the chemical elements in order of increasing atomic number
  4. 10. the horizontal rows of the periodic table
  5. 11. each of more than one hundred substances that cannot be chemically interconverted
Down
  1. 1. made up or consisting of two or more existing parts or elements
  2. 3. neutral electric charge
  3. 4. basic unit of a chemical unit
  4. 5. positive electric charge
  5. 6. negative electric charge
  6. 8. a group of atoms bonded together