The only stable isotope that does not contain any of them is Protium.
In isolation, these have a half-life of approximately ten minutes, but they are very stable where they are usually found. Their discovery paved the way for the creation of elements heavier than Uranium and the atomic bomb, and they were initially isolated by bombarding light elements with high-energy alpha particles. The only stable isotope that does not contain any of them is Protium. The Nobel Prize was awarded in 1935 to James Chadwick for identifying them. Name these subatomic particles that are slightly more massive than protons and have no electric charge.
In isolation, these have a half-life of approximately ten minutes, but they are very stable where they are usually found.
Neutron(s)