Across
- 3. Columns on the periodic table
- 7. A table holding the chemical elements organized by atomic number
- 8. The Center of an atom
- 9. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 10. The Basic Unit of a chemical element
Down
- 1. The electrons on the outermost energy level
- 2. Rows on the Periodic Table
- 4. Positive Charged subatomic particle
- 5. Negative Charged Subatomic Particle
- 6. A substance that cannot be broken down into simpler substances by chemical means.