Radioactive ____ release radiation from the ____ of their atoms. This radiation can be ____, beta or gamma radiation. Alpha radiation is a ____ nucleus being emitted, when this occurs the nucleus looses 2 protons and 2 neutrons. This causes the atomic number to decrease by ____ and the mass number to decrease by 4. Beta decay occurs when a fast moving ____ is emitted from the nucleus. This causes the atomic number to ____ by 1. The mass number does not change. The decay of ____ isotopes is completely ____, no one can predict when an individual atom might ____. Whilst it isn't possible to say which individual nucleus will decay next, because there are so many ____ in a sample it is possible to calculate how many will decay over a set period of ____. Half-life is the time it takes for ____ of the unstable nuclei in a sample to decay, alternatively it could be described as the time it takes for the ____ or count rate of the sample to halve.

summary nuclear decay

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