Across
- 2. The center of an atom
- 4. Is made of substance called elements
- 8. Has little mass,but it has negative electric charge the same.
- 10. anything that has volume and mass
Down
- 1. Atoms of the same element is the average of the mass number
- 3. is a tiny particle that has mass and a positive .
- 5. Is a tiny particle with approximately the same mass
- 6. Numbers- Of protons in an atoms nucleus
- 7. An atom that gains or loses one or more electrons from its outermost.
- 9. Number- The sum of the protons and the nucleus in an atom nucleus