An element undergoes gamma decay to form lead-206. What was the identity of that element?

Bismuth-210

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Bismuth-206

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Lead-210

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Lead-206

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Thallium-210

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Solution

The correct option is E Lead-206
Lead-206 undergoes gamma decay to form lead-206.
$_{82}^{206} P b \to_{82}^{206} P b + γ$
During gamma decay, only energy is lost. There is no change in the atomic number and mass number.

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