None of the above 18. Refer to the table of radioactive elements. None of the above 19. Refer to the table of radioactive elements. None of the above 20.
All radioactive elements decay at the same rate.
There were no daughter atoms present when the material first formed. All radioactive parent atoms decay into the same daughter. None of the above are major assumptions of radiometric dating. It must be inorganic. It must contain silicon and oxygen.