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