Radiation

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. A radioactive gaseous element formed by the disintegration of radium (5)
  2. 6. An intensely radioactive metallic element that occurs in minute amounts in uranium ores (6)
  3. 8. Deriving destructive energy from the release of atomic energy (7)
  4. 12. An attack that ___ into enemy territory (11)
  5. 15. An elementary particle with negative charge (plural) (9)

Down

  1. 1. The 2nd letter of the Greek alphabet (4)
  2. 2. Any of several trees producing edible oval fruit having a smooth skin and a single hard stone (4)
  3. 3. A column of light (plural) (4)
  4. 4. English chemist and physicist who formulated atomic theory and the law of partial pressures (6)
  5. 5. German physicist who developed the ___ counter (6)
  6. 7. A person's social heritage: previous experience or training (10)
  7. 9. A silvery ductile metallic element found primarily in bauxite (9)
  8. 10. A unit strength of a radioactive source equal to one million disintegrations per second (10)
  9. 11. A heavy toxic silvery-white radioactive metallic element (7)
  10. 13. A measured portion of medicine taken at any one time (4)
  11. 14. A hypothetical description of a complex entity or process (5)