Kaylee & Alyssa crossword a&p

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Across
  1. 3. What is the two dimensional representation that the electrons occupy.
  2. 6. that does not apply to both neutrons and proteins in nuclei rule.
  3. 8. the central region of an atom.
  4. 9. Present in the body in very small amounts.
  5. 10. What is a pure substance composed of atoms of only one kind.
  6. 11. 600 billion trillion
  7. 14. The attraction between opposite electrical charges.
  8. 15. Electrons that travel around the nucleus at high speed, within a spherical area which is called?
Down
  1. 1. Electrons travel in complex patterns around nucleus.
  2. 2. Protons plus neutrons.
  3. 4. What holds the participating atoms together once the chemical reaction has needed.
  4. 5. The sum of the atomic weights of it's component atoms of a molecule.
  5. 7. How many elements exist in nature?
  6. 12. What are atoms composed of?
  7. 13. Which is the simplest atom with an atomic number of 1.