Across
- 3. element 83
- 4. column
- 6. also known as boron
- 7. when an electron switches energy levels
- 9. determine the atomic mass and half-life
- 10. average mass number of an element
Down
- 1. silicon's atomic number
- 2. valence electrons are in the ___ energy level
- 5. row
- 8. not reactive