On a scale arranged according to the increasing mass of their nuclei, uranium is one of the heaviest of all the naturally-occurring elements (Hydrogen is the lightest). Like other elements, uranium occurs in several slightly differing forms known as 'isotopes'.These isotopes differ from each other in the number of uncharged particles (neutrons) in the nucleus.
These are the most common naturally occurring isotopes of oxygen and carbon, respectively. An atom of carbon-14 contains 6 protons and 8 neutrons and is denoted Certain isotopes of elements are unstable, giving off ionizing radiation, also known as radioactivity.
The following data was collected from a compilation of data from the CRC Handbook and other references.
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An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element.
The nuclei of most atom s contain neutrons as well as protons.