Across
- 1. 16 elements on the periodic table
- 3. protons,neutrons,and electrons
- 5. the basic unit of a Chemical element
- 6. positive charge subatomic particle
- 7. 24 elements made by man-kind (2 words)
- 9. negative charge
Down
- 1. 7 element on the periodic table
- 2. protons+neutrons (2 words)
- 4. 7 elements on the periodic table
- 8. inside an atom