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Across
  1. 2. can combine to become elements or compounds, atoms are the smallest invisible particles that makeup everything
  2. 4. a subatomic particle with a neutral charge and is in the nucleus
  3. 5. the space where the protons and neutrons sit
  4. 7. a subatomic particle with a positive charge and is in the nucleus
  5. 8. symbol Unique symbol of the element
  6. 9. when two or three atoms are chemically combined
  7. 12. atoms of an element with differing numbers of neutrons
  8. 13. number The total number of protons and electrons
Down
  1. 1. an atom all on its own they are all the same atom
  2. 2. number Number of protons which equal to the number of electrons
  3. 3. is smaller than or occurring within an atom
  4. 6. a subatomic particle with a charge of negative electricity
  5. 7. The name given to the horizontal rows in the periodic table
  6. 10. shell The outer shell is the outer shell of an atom
  7. 11. the name given to the vertical columns in the periodic table