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From left to right, the isotopes are protium ( Isotopes are variants of a particular chemical element which differ in neutron number.
This is an example of Aston's whole number rule for isotopic masses, which states that large deviations of elemental molar masses from integers are primarily due to the fact that the element is a mixture of isotopes.
radioactive elements) between uranium and lead, although the periodic table only allowed for 11 elements from uranium to lead.
Attempts to place the radioelements in the periodic table led Soddy and Kazimierz Fajans independently to propose their radioactive displacement law in 1913, to the effect that alpha decay produced an element two places to the left in the periodic table, whereas beta decay emission produced an element one place to the right.
The term isotopes (originally also isotopic elements).
However, because isotope is the older term, it is better known than nuclide, and is still sometimes used in contexts where nuclide might be more appropriate, such as nuclear technology and nuclear medicine.
Adding in the radioactive nuclides that have been created artificially, there are 3,339 currently known nuclides.