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