The atomic ratio between U-238 and U-234 in a sample is 1.8*10^4. The half life of U-238 is 2.5*10^5 years. Find the half life of U-234.
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During α-decay, an atomic nucleus emits an alpha particle. It transforms (or decays) into an atom with an atomic number 2 less and a mass number 4 less.
Thus, uranium-238 decays through α-particle emission to form thorium-234 according to the equation:
238
92
U
→
l
234
90
Th
+
4
2
He
Note that the sum of the subscripts (atomic numbers or charges) is the same on each side of the equation.
Also, the sum of the superscripts (masses) is the same on each side of the equation.
α Decay
Explanation:
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