Across
- 3. Bond where electrons are shared
- 5. One or two letter representation of an element
- 8. Average mass of an element's atoms
- 10. Bond where electrons are transferred
- 11. Horizontal row on the periodic table
- 12. Negatively charged ion
Down
- 1. Small number at the lower right in a chemical formula
- 2. Vertical column on the periodic table
- 4. Number of protons in an atom
- 6. 6.022 x 10^23 particles
- 7. Positively charged ion
- 9. Number placed before a chemical formula