Across
- 3. two or more formes of the same element
- 6. appearing or occurring at an interval
- 7. a subatomic particle in all atoms
- 9. a neutral particle
- 10. a negativity charged particle
Down
- 1. this is the smallest unit of matter
- 2. the proses of sending off energy
- 4. a concept of atom that have a periodic number
- 5. a three dimensional representation of a person or thing
- 8. a central part of an atom