Question

Which of the following element converted to $P{b}^{206}$ on gamma decay ?

• A. bismuth-210
• B. bismuth-206
• C. lead-210
• D. lead-206
• E. thallium-210

Answer 1

The correct option is D lead-206

In gamma decay reactions, the parent nucleus does not loose its identity but it comes down to its ground state from its excited state.

$\gamma$ decay : ${}_Z^A{X}^{\ast }{\to }_Z^{A}X+\gamma$ where $X^{\ast }$ represents the excited state.

Hence gamma decay of lead-206 will convert it to lead-206.