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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 | chemistry | Britannica.com

www.britannica.com/science/isotope

Oct 4, 2010 ... Evidence for the existence of isotopes emerged from two ... ores of the radioactive elements uranium and thorium had been found to contain ...

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 ...

Six New Isotopes of the Superheavy Elements Discovered ...

newscenter.lbl.gov/2010/10/26/six-new-isotopes/

Oct 26, 2010 ... The discovery of six new isotopes, reaching in an unbroken chain of ... of an “ Island of Stability,” a group of long-lasting isotopes thought to exist ...

Isotopes - ChemTeacher

chemteacher.chemeddl.org/services/chemteacher/index.php?option=com_content&view=article&id=75

Isotopes create variance within atoms of the same element. ... Henri Becquerel ( 1852-1908) discovered the existence of multiple masses for the same element ...

Atomic theory: atoms, elements, 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), ...

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.

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.

Fluorine - Element information, properties and uses | Periodic Table

www.rsc.org/periodic-table/element/9/fluorine

Discovery date, 1886. Discovered by, Henri Moissan. Origin of the name, The ... State at 20°C, Gas, Key isotopes, <sup>19</sup>F. Electron .... Oxidation states and isotopes  ...

Lithium - Element information, properties and uses | Periodic Table

www.rsc.org/periodic-table/element/3/lithium

Discovery date, 1817. Discovered by, Johan August Arfvedson. Origin of the ... State at 20°C, Solid, Key isotopes, <sup>7</sup>Li. Electron .... Oxidation states and isotopes  ...

More Info

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

www.encyclopedia.com

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, ...

Why do isotopes exist? | Reference.com

www.reference.com

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 - The Worlds of David Darling

www.daviddarling.info

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, ...