Kaylee & Alyssa crossword a&p

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