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The atomic symbol 206
82 Pb represents lead-206 (Pb-206), an isotope that has 82 protons and 124 neutrons. Which atomic symbol could represent an isotope that undergoes radioactive decay to produce Pb-206?
A.  238
        92 U

B.  222
       87 Pb

C.  178
        72 Hf

D.  192
        77 Pb

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taskmasters
I think the correct answer from the choices listed above is option A. The atomic symbol that could represent an isotope that undergoes radioactive decay to produce Pb-206 would be  238 92 U. U-238 decays into Pb-206 with a half-life of 4.5 × 10^9 years. Hope this answers the question. Have a nice day.
Dejanras

Answer is: A. 238/92 U.

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

The decay chain of ²³⁸U is called the uranium series.

Decay start with U-238 and ends with Pb-206. There are several alpha and beta minus decays.

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

In beta minus decay atomic number Z is increased by one, neutron is converted to a proton and an electron and an electron antineutrino.

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