To find the number of neutrons in an isotope, you can use the formula:
\[ \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \]
For selenium-83 (\( ^{83}\text{Se} \)):
- The mass number is 83.
- The atomic number of selenium (Se) is 34.
So, the number of neutrons is:
\[ 83 - 34 = 49 \]
Therefore, selenium-83 has 49 neutrons.
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