If the product of the process is Th-234, the we now know that the original atom must be U-238.
What is an alpha decay?
An alpha decay is said to occur when there is the loss of an alpha particle from an atom. Now we know that when there is a loss of an alpha particle, the mass number is decreased by 4 four units while the atomic number is decreased by two units.
If the product of the process is Th-234, the we now know that the original atom must be U-238. It is found two places after the thorium atom in the periodic table.
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