Question

Archaeologists use radioactive decay of an isotope of the element ________ because it has a fairly short half-life and is found in anything that was once living.

cobalt
uranium
carbon
technetium

Answer 1

Carbon

Answer 2

They use C-14 ,otherwise known as carbon 14.
This technique is called Carbon Dating.

Answer 3

thanks so much ! (:

Answer 4

:)