Across
- 4. Center of an atom
- 5. The NUMBER of protons an atom's nucleus
- 8. Sum of protons and neutrons in an atoms nucleus
- 10. A tiny partical that has mass and a positive energy charge.
Down
- 1. Classified and arranged, according to their chemical properties in the periodic table.
- 2. An atom that gains or loses one or more electron.
- 3. A Tiny particle with approximately the same mass as a proton
- 6. Atoms of the same element that have a different mass number
- 7. Can't be broken into simpler substances by physical or chemical mass.
- 9. Anything that has volume and mass