Do scientists use radioactive dating
Materials that emit this kind of radiation are said to be radioactive and to undergo radioactive decay.In 1899, Ernest Rutherford discovered that uranium compounds produce three different kinds of radiation.Once again, Einstein's equation, E=mc, explains that the mass that is lost it converted into energy carried away by the fusion products.Even though fusion n is an energetically favorable reaction for light nuclei, it does not occur under standard conditions here on Earth because of the large energy investment that is required.In 1896, Henri Becquerel was working with compounds containing the element uranium.To his surprise, he found that photographic plates covered to keep out light became fogged, or partially exposed, when these uranium compounds were anywhere near the plates.An example of a fusion reaction important in thermonuclear weapons and in future nuclear reactors is the reaction between two different hydrogen isotopes to form an isotope of helium: This reaction liberates an amount of energy more than a million times greater than one gets from a typical chemical reaction.Such a large amount of energy is released in fusion reactions because when two light nuclei fuse, the sum of the masses of the product nuclei is less than the sum of the masses of the initial fusing nuclei.
A change in nuclear charge means that the element has been changed into a different element.Nuclear half-lives range from tiny fractions of a second to many, many times the age of the universe.For more information on half-life and isotopes, please refer to the Isotopes Project at LBNL where you can also find the Table of Isotopes online.If nuclei come close enough together, they can interact with one another through the strong nuclear force, and reactions between the nuclei can occur. Two major classes of nuclear reactions are of importance: fusion and fission.As in chemical reactions, nuclear reactions can either be exothermic (i.e. Fusion is a nuclear process in which two light nuclei combine to form a single heavier nucleus.
An atom consists of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged electrons.