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