Sodium-24 has a half-life of 15 hours. If there are 800 g of Na-24 initially, How long it will take for 750 g of Na-24 to decay?
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Explanation:
Sodium 24 has a half life of 15 hours
Figure 7: Decay scheme of a radioactive sodium-24 (24Na) nucleus. With a half-life of 15 hours, it decays by beta decay to an excited magnesium-24 (24Mg) nucleus. Two gamma rays are rapidly emitted and the excitation energy is carried off, whereby the stable ground state of magnesium-24 is reached.
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