Across
- 3. An election in the outermost energy level of an atom (2 words)
- 4. An abbreviation for an element or atom (2 words)
- 6. Positively charged particle
- 8. A count of the number of protons in the atomic nucleus (2 words)
- 9. Any material that is made up of only one type of atom
- 10. Negatively charged particle
Down
- 1. A chart in which all known elements are listed in order of atomic number (2 words)
- 2. Horizontal column is the periodic table
- 5. Vertical column in the periodic table
- 7. Particle with no charge