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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.
Theory predicts that many apparently "stable" isotopes/nuclides are radioactive, with extremely long half-lives (discounting the possibility of proton decay, which would make all nuclides ultimately unstable).
Of the 253 nuclides never observed to decay, only 90 of these (all from the first 40 elements) are theoretically stable to all known forms of decay.
Each stream created a glowing patch on the plate at the point it struck.
Thomson observed two separate patches of light on the photographic plate (see image), which suggested two different parabolas of deflection. Aston subsequently discovered multiple stable isotopes for numerous elements using a mass spectrograph.
For example, of which 286 are primordial nuclides, meaning that they have existed since the Solar System's formation.