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==Key Stage 5==
===Meaning===
An '''beta minus particle''' ('''β^--particle''') is a type of [[Ionising Radiation|ionising radiation]] made of an [[electron]] [[emit]]ted from the [[Atomic Nucleus|nucleus]] of an [[Unstable Isotope|unstable isotope]] when a [[neutronDown-quark]] turns into a [[protonUp-quark]].
===About Beta Particles===