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...
Evidence for the existence of isotopes emerged from two independent lines of ...
of the radioactive elements uranium and thorium had been found to contain ...
To express this newly discovered complexity of matter, the terms "isotopic ... That
paper summarized good evidence for the existence of isotopes among ...
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
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
Aug 26, 2015 ... Neutrons were the last particle to be discovered because they had no ... more
than 10 years after the existence of isotopes was confirmed.
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 ...
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), ...
Discovery date, 1790. Discovered by, Adair Crawford. Origin of ... State at 20°C,
Solid, Key isotopes, <sup>86</sup>Sr, <sup>87</sup>Sr, <sup>88</sup>Sr. Electron .... Oxidation states and isotopes ...
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