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Audio Video Interleaved Video  |  2012-12-18  |  17.6 MB  |  400x400  |  10fps  |  1 minute, 39 seconds
Transcription: Alpha decay, like all radioactive decay, starts with an unstable nucleus. Consider the unstable nucleus polonium-214. The periodic chart says any polonium atom has 84 protons, so we know this has 84 protons. It has a total of 214 protons and neutrons in its nucleus. Well, if the total is 214 and there are 84 protons, there must be 130 neutrons. This is an unstable nucleus, so it needs to change configuration. The way this nucleus changes its configuration is by actually taking two protons and two neutrons and spitting them out of the nucleus. Once these protons and neutrons leave the nucleus, ...