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One important measure of the rate at which a radioactive substance decays is called half-life, or t1/2. Half-life is the amount of time needed for one half of a given quantity of a substance to decay. Half-lives as short as 10–6 second and as long as 109 years are common.
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Therefore 500 ml of solution have 0.25 mol of NaCl .. = 14.61 g (ans.)
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4 & 5 have the same number of elements
Uranium-238 is the element that undergoes decay to yield uranium-234
