Kaylee & Alyssa crossword a&p

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