Dating rocks using radioactive isotopes is called dating dating direct ratemybody
Although it is not obvious at first, -decay increases the ratio of neutrons to protons.
(Only a handful of nuclides with atomic numbers less than 83 emit an -particle.) The product of -decay is easy to predict if we assume that both mass and charge are conserved in nuclear reactions.
The reaction is usually accompanied by the ejection of one or more neutrons.
In 1934 Enrico Fermi proposed a theory that explained the three forms of beta decay.
The mass defect of an atom reflects the stability of the nucleus.
It is equal to the energy released when the nucleus is formed from its protons and neutrons.