Across
- 2. Protons plus neutrons.
- 4. What are atoms composed of?
- 6. that does not apply to both neutrons and proteins in nuclei rule.
- 10. Present in the body in very small amounts.
- 11. Electrons travel in complex patterns around nucleus.
Down
- 1. What holds the participating atoms together once the chemical reaction has needed.
- 3. 600 billion trillion
- 5. The attraction between opposite electrical charges.
- 7. What is a pure substance composed of atoms of only one kind.
- 8. The sum of the atomic weights of it's component atoms of a molecule.
- 9. How many elements exist in nature?