- noun the process in the nucleus of an atom in which a proton is transformed into a neutron, reducing the atomic number by one
- noun the formation of a negative ion when an extra electron is acquired
- A form of radioactive decay in which an electron from an inner shell is absorbed by the nucleus, combining with a proton, thereby reducing the atomic number of the atom by one. A neutron is formed, with the concomitant emission of a neutrino.
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