<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2014) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th> Nuclear physics </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Td> Nucleus Nucleons (p, n) Nuclear matter Nuclear force Nuclear structure Nuclear reaction </Td> </Tr> <Tr> <Td> Models of the nucleus (show) Liquid drop Nuclear shell model Interacting boson model Ab initio </Td> </Tr> <Tr> <Td> Nuclides' classification (show) Isotopes--equal Z Isobars--equal A Isotones--equal N Isodiaphers--equal N − Z Isomers--equal all the above Mirror nuclei--Z ↔ N Stable Magic Even / odd Halo </Td> </Tr> <Tr> <Td> Nuclear stability (show) Binding energy p--n ratio Drip line Island of stability Valley of stability </Td> </Tr> <Tr> <Td> Radioactive decay (show) Alpha α Beta β (2β, β) K / L capture Isomeric (Gamma γ Internal conversion) Spontaneous fission Cluster decay Neutron emission Proton emission Decay energy Decay chain Decay product Radiogenic nuclide </Td> </Tr> <Tr> <Td> Nuclear fission (show) Spontaneous Products (pair breaking) Photofission </Td> </Tr> <Tr> <Td> Capturing processes (show) electron neutron (s r) proton (p rp) </Td> </Tr> <Tr> <Td> High energy processes (show) Spallation (by cosmic ray) Photodisintegration </Td> </Tr> <Tr> <Td> Nucleosynthesis and nuclear astrophysics (show) Nuclear fusion Processes: Stellar Big Bang Supernova Nuclides: Primordial Cosmogenic Artificial </Td> </Tr> <Tr> <Td> High energy nuclear physics (show) Quark--gluon plasma RHIC LHC </Td> </Tr> <Tr> <Td> Scientists (show) Alvarez Becquerel Bethe A. Bohr N. Bohr Chadwick Cockcroft Ir. Curie Fr. Curie Pi. Curie Skłodowska - Curie Davisson Fermi Hahn Jensen Lawrence Mayer Meitner Oliphant Oppenheimer Proca Purcell Rabi Rutherford Soddy Strassmann Szilárd Teller Thomson Walton Wigner </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Nuclear physics </Th> </Tr>

Explain why one of the electrons loses energy while the other does not