Across
- 2. how much the usual atom of an element weighs
- 4. particle with positive charge located in an atoms nucleus
- 7. particle with a neutral charge located in the nucleus
- 8. what the rings around an atom are called
- 9. an elements number of protons and where it is located on the periodic table
- 10. particle with a negative charge located outside the nucleus
Down
- 1. the electrons on the outer shell of an atom
- 3. forms of the same element with different numbers of protons or electrons
- 5. periods in the periodic table going horizontally
- 6. groups in the periodic table going vertically