Across
- 3. Substance made up of only one type of atom.
- 6. Atoms of the same element with different numbers of neutrons.
- 7. Emission of energy as electromagnetic waves or subatomic particles.
- 8. Representation or simulation of something.
- 9. The fundamental unit of matter.
- 10. Negatively charged particle orbiting an atom's nucleus.
Down
- 1. Central core of an atom.
- 2. Neutral particle in an atom's nucleus.
- 4. Pertaining to the periodic table of elements.
- 5. Positively charged particle in an atom's nucleus.