Matter

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