Examine the equation. 23490Th→23088Ra+42He What kind of barrier would you need to block the radioactive particles from this reaction? A. a sheet of aluminum foil B. a piece of paper C. a solid concrete block D. a two-inch block of lead
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An alpha particle is similar to a doubly ionized helium atom as both have two protons and two neutrons in their nucleus.
In the question, we have a helium atom on the right side of the equation which we can assume to be an alpha particle.
Alpha particles can be stopped by a sheet of paper and thus the correct answer is B.
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