Across
- 2. – A very small piece of matter, like an atom or subatomic particle.
- 4. – The most accurate model showing electrons moving in regions called electron clouds.
- 7. – The smallest unit of matter that makes up everything around us.
- 8. – The number of protons in an atom that tells what element it is.
- 11. – He found that atoms have a tiny, dense nucleus in the center.
- 12. – He discovered the electron and said atoms look like “plum pudding” with electrons inside.
- 13. – The total mass of an atom, based on the number of protons and neutrons.
- 15. – An idea or explanation that is supported by many experiments.
- 16. – The center of the atom that contains protons and neutrons.
- 18. – The study of matter, its properties, and how it changes.
- 19. – A particle with no charge found in the nucleus of an atom.
- 20. – A particle with a positive charge found in the nucleus of an atom.
Down
- 1. – He said matter is made of small, solid atoms that cannot be divided.
- 3. – Anything that has mass and takes up space.
- 5. – A line that shows the order of events over time.
- 6. – A simple way to explain something complex, like the structure of the atom.
- 9. – A picture or explanation of how scientists think the atom looks.
- 10. – The path where electrons move around the nucleus in certain energy levels.
- 14. – He explained that electrons move in set paths or “orbits” around the nucleus.
- 17. – A tiny particle with a negative charge that moves around the nucleus.