Across
- 3. the protons that are = to the electrons
- 7. anything that has mass and takes up space
- 9. the part of the atom that has no charge
- 10. the name of the element
- 12. the number of protons + neutrons (P+N)
Down
- 1. the smallest whole unit of matter
- 2. the center of an atom
- 4. the letter(s) that represent an element
- 5. the negatively charged part of an atom
- 6. a thing made of one type of atom that can't be broken
- 8. positively charged part of an atom
- 11. how much matter an object is made up of