Across
- 2. anything with volume and mass
- 4. depressed particle
- 8. the sum of protons and neutrons in an atoms nucleus
- 9. a happy particle
- 10. an atom that loses an electron
Down
- 1. number of protons in an atoms nucleus
- 3. indifferent particle
- 5. the most basic kind of matter that cant be broken down
- 6. the smallest particle of an element
- 7. atoms of the same element but different mass