nucleus of all atoms. It has a positive electric charge that is equal to the negative charge of the electron. A neutron is a subatomic particle that has no electric charge. The mass of the neutron must exceed that of the proton in order for the stable elements to exist. But the neutron can only exceed the mass of the proton by an extremely small amount—an amount which is exactly twice the mass of the electron. That critical point of balance is only one part in a thousand. If the ratio of the mass of the…
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