A radioactive element that becomes stable in a half-life is only up to 50 percent.
A radioactive element is an element composed of atoms where the nucleus part is considered to be unstable and emits atomic radiation.
When a radioactive element crosses almost half of its life, then half of the element has been consumed to break down an unstable material into stable ones. It means that the intensity of the material at the starting is 100% but after half of its life, it is cut down to 50%.
Therefore, only fifty percent of the elements become stable at the end of half of their life.
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