Across
- 2. the spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter from the nucleus.
- 6. a stable subatomic particle with a charge of negative electricity.
- 7. the theory that atoms cannot be broken down anymore. (creator)
- 11. emitting or relating to the emission of ionizing radiation or particles.
- 13. proposed a theory for the atom that energy is transferred only in certain well defined quantities.
- 14. a positively charged ion, i.e. one that would be attracted to the cathode in electrolysis.
- 16. the smallest particle of a chemical element that can exist.
- 18. a negatively charged ion, i.e. one that would be attracted to the anode in electrolysis.
- 20. a stable subatomic particle with a positive charge
- 21. penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei
- 22. plum pudding theory
- 25. A row of elements in the periodic table.
Down
- 1. shell the outermost shell of an atom
- 3. a subatomic particle with no electric charge.
- 4. a thing that is composed of two or more separate elements; a mixture.
- 5. H2O
- 8. His experiments changed the way people thought about the inside of the atom.
- 9. medical care given to a patient for an illness or injury
- 10. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- 12. the identification of the nature and cause of a certain phenomenon.
- 15. a helium nucleus emitted by some radioactive substances, originally regarded as a ray.
- 17. a fast-moving electron emitted by radioactive decay of substances
- 19. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
- 23. the central and most important part of an object.
- 24. also known as a family is a column in a periodic table.