where are isotopes found on the periodic table
Isotope Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
History of the periodic table In 1864, the English chemist John Newlands classified the sixty-two known elements into eight groups, based on their physical properties.[8][9][6]