Chemistry Practice Problems Radioactive Decay Practice Problems Solution: Which isotope would produce lead-206 after alpha d...

Solution: Which isotope would produce lead-206 after alpha decay?A. polonium-210B. radon-222C. mercury-202D. bismuth-208E. thallium-204

Problem

Which isotope would produce lead-206 after alpha decay?

A. polonium-210
B. radon-222
C. mercury-202
D. bismuth-208
E. thallium-204

Solution

We are asked of the isotope that would produce lead-206 in alpha decay. 

An alpha particle is comprised of 2 protons and 2 neutrons. 


Note: Lead (Pb) has atomic number 82. "206" in lead-206 is the mass number.  

This means that the incomplete reaction would look like: 

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