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Why do nuclei undergo transmutation? The half-life of thorium-230 is 7.54 ✕ 104 years. What is the decay constant for thorium? How to answer questions on Venn diagrams in set theory? Hypothetical math quiz . if 1,000 years is as 1 day ( a 24 hour period) what would 30 minutes be ? Based on your observations list three characteristics (structural or molecural )that all four species have in common?