Define Half-life period.
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Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive ...
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Half-life of a radioactive elements is the duration of time in which half of the nuclei disintegrated.
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