Radioactivity

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 4. An elementary particle with negative charge (8)
  2. 6. A unit of magnetic field strength equal to one-hundred-thousandth of an oersted (5)
  3. 8. A stable particle with positive charge equal to the negative charge of an electron (plural) (7)
  4. 10. A silvery ductile metallic element found primarily in bauxite (9)
  5. 12. To take up mentally (8)
  6. 15. The time required for something to fall to ___ its initial value (8)
  7. 16. The 1st letter of the Greek ___ (5)

Down

  1. 1. Center of an atom or a cell (7)
  2. 2. An impetuous rush toward someone or something (6)
  3. 3. A very light colorless element that is one of the six inert gasses (6)
  4. 5. An elementary particle with 0 charge and mass about equal to a proton (plural) (8)
  5. 7. A mixture of gases required for breathing (3)
  6. 9. Energy that travels in waves or particles (9)
  7. 11. A particle that is electrically charged (3)
  8. 13. The 2nd letter of the Greek alphabet (4)
  9. 14. A material made of cellulose pulp derived mainly from wood or rags or certain grasses (5)