The presence of neutrons stabilizes the nucleus by shielding protons from the Coulomb repulsion exerted by the other protons in the nucleus while also contributing to the strong force. Radioactivity A . Radioactive decay law 1 . The half-life of a radioactive element is the time in which half of the radioactive nuclei in a sample decay. Radioactive dating a .
Organisms absorb carbon via respiration or consumption.
Quantity of 12 C within the remains of the organism remains the same. Measure the ratio of 14 C to 12 C within the remains of the organism today. The same technique can be used to find the age of rocks using elements with longer half-lives. Conservation laws a . Energy b .