Across
- 2. invisible building block of all matter.
- 4. A proton is a stable, positively charged subatomic particle found within the nucleus of every atom.
- 7. the 118 things on the periodic table
- 8. when atoms from different elements combine, creating a substance with new properties
- 9. A negitive charged particle that orbits the nucleus of an atom
- 10. positive charge in the center core of an atom
Down
- 1. takes up space and mass
- 3. physical combination of 2 or more substances
- 5. particle found in the nucleus of an atom
- 6. has groups and periods and made by Dmitri Mendeleev