Physics D Crossword

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Across
  1. 1. the breaking down of an element
  2. 3. a form of an element with a different number of electrons
  3. 4. Holds the orbiting electrons
  4. 6. made the plum pudding model
  5. 7. Contains the neutrons and protons in the atom
  6. 8. called the father of modern physics
  7. 10. has a proton number of 2
  8. 12. has medium penetration and ionisation
Down
  1. 2. the least penetrating and most ionising form of radiation
  2. 3. variation of an element with different number of neutrons
  3. 5. has a negative charge
  4. 9. how long it takes for an unstable element to decay by half
  5. 11. the most penetrating and least ionising form of radiation