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| the spontaneous emissions of radiation from the nucleus of an atom. [image] |
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| The dense centre of an atom;part of an atom containing all of the positive charge and almost all of the mass of the atom. [image] |
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A very high-energy type of electromagnetic radiation emitted during gamma decay of a radioactive atom. γ [image] |
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An electron emitted during beta decay of a radioactive atom. β
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| The average lenght of time for half of the parent nuclei in a sample to decay. |
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| Consists of two protons and two neutrons;emitted durin alpha decay of a radioactive atom.[image] |
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