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==Key Stage 5==
===Meaning===
[[Alpha Decay|Alpha decay]] is a type of [[Radioactive Decay|radioactive decay]] where an [[Unstable Isotope|unstable ]] [[Atomic Nucleus|nucleus]] emits [[emit]]s an [[alpha particle]] consisting of two [[proton]]s and two [[neutron]]s.
===About Alpha Decay===
*Reduces the [[Atomic Number]] atomic number by 2 and the [[Atomic Mass|mass number]] by 4.
*Common in heavy [[element]]s like [[uranium]] and [[radium]].
*[[Alpha particles]] have low [[Penetration Depth|penetration depth]] but high ionizing power.