MHT CET · Chemistry · Chemical Kinetics
\({ }_{90} \mathrm{Th}^{228}\) emits four alpha and one beta particles. Number of neutrons in daughter element is
- A 129
- B 190
- C 232
- D 138
Answer & Solution
Correct Answer
(A) 129
Step-by-step Solution
Detailed explanation
\(90 \mathrm{Th}^{228} \underset{-4 \alpha}{\longrightarrow} 82^{212} \underset{-\beta}{\longrightarrow}{ }_{83} \mathrm{Y}^{212}\)
daughter element
Number of neutrons = mass number - atomic number
\(
\begin{array}{l}
=212-83 \\
=129
\end{array}
\)
daughter element
Number of neutrons = mass number - atomic number
\(
\begin{array}{l}
=212-83 \\
=129
\end{array}
\)
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