Matter Revision

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Across
  1. 3. Scientist that developed the current model of the atom with electron shells
  2. 4. Radioactive particle with 2 protons and 2 neutrons
  3. 5. Positively charged particle of an atom
  4. 9. A positive ion
  5. 11. Describes an unstable isotope that releases radiation
  6. 14. Negatively charged particle of an atom
  7. 17. Scientist who developed the plum pudding model
  8. 19. Substance made up of 2 or more different elements
  9. 20. A negative ion
  10. 21. Horizontal row of the periodic table
  11. 22. The kind of electric charge generated by protons
  12. 24. When an unstable isotope converts into its stable form by releasing radiation
  13. 26. Outer region of an atom containing the electrons
  14. 27. Neutrally charged particle of an atom
Down
  1. 1. Vertical column of the periodic table
  2. 2. The identification of an illness by a medical professional
  3. 3. Produced when a neutron turns into a proton and an electron
  4. 6. A type of medicine used to try cure a disease or illness
  5. 7. Outer most electron shell
  6. 8. Scientist who did the gold foil experiment
  7. 10. Emitted when the nucleus is still excited after previous emissions
  8. 12. H2O
  9. 13. An atom with more or less neutrons than normal
  10. 15. The kind of electric charge generated by electrons
  11. 16. Part of an atom in the middle containing protons and neutrons
  12. 18. An atom with more or less electrons than normal
  13. 23. Pure substances that cannot be broken down into anything other substance
  14. 24. Scientist who discovered the link between elements and atoms
  15. 25. The smallest part of a chemical element