Web Results

Isotope - Wikipedia

en.wikipedia.org/wiki/Isotope

Isotopes are variants of a particular chemical element which differ in neutron number. .... The existence of isotopes was first suggested in 1913 by the radiochemist ... F. W. Aston subsequently dis...

isotope | Examples & Definition | Britannica.com

www.britannica.com/science/isotope

Dec 12, 2016 ... Evidence for the existence of isotopes emerged from two ... ores of the radioactive elements uranium and thorium had been found to contain ...

Isotopes facts, information, pictures | Encyclopedia.com articles ...

www.encyclopedia.com/science-and-technology/physics/physics/isotopes

Due to their high levels of radioactivity, they exist only for extremely short periods of time. ... The discovery of these particles, integral to the formation of isotopes, ...

isotope - The Worlds of David Darling

www.daviddarling.info/encyclopedia/I/isotope.html

Nearly all elements found in nature are mixtures of several different isotopes. ... it has been possible to find out how much of each isotope exists in each element, ...

Why do isotopes exist? | Reference.com

www.reference.com/science/isotopes-exist-75941fa0d3c396eb

Isotopes exist because the atomic nuclei of many elements are stable or somewhat ... Most radioactive isotopes are so unstable that they are not found in nature, ...

Isotope

abyss.uoregon.edu/~js/glossary/isotope.html

An isotope is one of two or more species of atoms of a chemical element with the ... that isotopy might exist in the main group of naturally occurring stable elements . ... This success was followed by the discovery that chlorine had two isotopes.

Isotopes: Soddy - Le Moyne

web.lemoyne.edu/~giunta/EA/SODDYann.HTML

To express this newly discovered complexity of matter, the terms "isotopic ... That paper summarized good evidence for the existence of isotopes among ...

Atomic number, atomic mass, and isotopes | Radiometric dating ...

www.khanacademy.org/science/biology/history-of-life-on-earth/radiometric-dating/a/atomic-number-atomic-mass-and-isotopes-article

For instance, a small amount of carbon exists in the atmosphere as radioactive carbon-14, and the amount of carbon-14 found in fossils allows paleontologists to  ...

Atoms, Elements, and the Nucleus - Chem1

www.chem1.com/acad/webtext/intro/int-1.html

May 13, 2016 ... These basic elements were not generally considered to exist as the actual ... Five more were discovered through the 17th Century. ..... For example, there are three natural isotopes of magnesium: <sup>24</sup>Mg (79% of all Mg atoms), ...

Technetium - Chemicool

www.chemicool.com/elements/technetium.html

Technetium's properties, discovery, videos, images, states, energies, appearance ... Technetium was once thought to exist only in samples produced in the laboratory. .... It is surrounded in the periodic table by elements with stable isotopes.