Radioactivity

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 1. A soft heavy toxic malleable metallic element (4)
  2. 3. A material made of cellulose pulp derived mainly from wood or rags or certain grasses (5)
  3. 4. Serious disease where cells grow out of control (6)
  4. 8. The 2nd letter of the Greek alphabet (4)
  5. 10. The time required for something to fall to ___ its initial value (8)
  6. 13. The vast area beyond Earth's atmosphere (5)
  7. 14. The part of a scene that lies behind objects in the foreground (10)
  8. 16. The smallest component of an element having the chemical properties of the element (4)

Down

  1. 2. The 1st letter of the Greek ___ (5)
  2. 5. Center of an atom or a cell (7)
  3. 6. Hard piece of stone (plural) (5)
  4. 7. A structure that has a roof and walls and stands more or less permanently in one place (plural) (9)
  5. 9. An investigator who is employed to find missing persons or missing goods (6)
  6. 11. The organic phenomenon of rotting (5)
  7. 12. A unit of magnetic field strength equal to one-hundred-thousandth of an oersted (5)
  8. 15. A piece of thin and flexible sheet metal (4)