Question:medium
A radioactive nucleus decays as follows:
\[
X \to X_1 \to X_2 \to X_3 \to X_4
\]
If the mass number and atomic number of \( X_4 \) are 172 and 69 respectively, the mass number and atomic number of \( X \) are:
A radioactive nucleus decays as follows:
\[
X \to X_1 \to X_2 \to X_3 \to X_4
\]
If the mass number and atomic number of \( X_4 \) are 172 and 69 respectively, the mass number and atomic number of \( X \) are:
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When dealing with radioactive decay, remember that alpha decay decreases both the atomic number and mass number, while beta decay increases the atomic number but leaves the mass number unchanged.
Updated On: Nov 28, 2025
- 72, 180
- 69, 170
- 68, 172
- 70, 177