periodic table/atomic structure crossword

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Across
  1. 2. An element is matter that is composed of one type of
  2. 5. number of protons and the number of neutrons in the
  3. 6. An element is matter that is composed of one type of
  4. 8. of an atom.
  5. 9. Protons and neutrons are made up of smaller particles called
  6. 10. are particles with an electrical charge of 1.
  7. 12. The vertical columns in the periodic table are called
  8. 13. are neutral particles that do not have an electrical charge.
Down
  1. 1. are particles with an electrical charge of 1.
  2. 3. Atmos of the same element that have different numbers of neutrons called
  3. 4. The of an atom is the sum of
  4. 7. cloud The area around the nucleus of an atom
  5. 11. Protons and neutrons are found in a small, positively charged center of the atom called the