Across
- 2. the distance from the nucleus of am atom
- 4. the number of protons found in the nucleus of an element Atomic
- 7. cloud all of the area inside an atom surrounding the nucleus
Down
- 1. the weighted average mass of an element
- 3. the smallest unit of an element
- 5. may be positive negative or neutral
- 6. positively charged subatomic particle
- 8. a negatively charged subatomic particle of electrons cloud
- 9. the tiny very dense positively charged region