Across
- 4. the smallest particle of a chemical element that can exist.
- 5. a stable negatively charged component of an atom
- 9. the positively charged central core of an atom
- 10. an uncharged elementary particle that has a mass nearly equal to that of the proton
Down
- 1. the emission of energy as electromagnetic waves
- 2. relating to the periodic table of the elements
- 3. an approximation or simulation of a real system that omits all
- 6. a stable subatomic particle occurring in all atomic nuclei
- 7. a substance whose atoms all have the same number of protons
- 8. a form of chemical element whose atomic nucleus contains a specific number of neutrons