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What nuclide is formed when 90Sr undergoes
β
− decay?
1. 90Rb
2. 86Kr
3. 89Sr
4. 94Zr
5. 90Y
In a [tex]\beta^{-}[/tex] decay, the nucleus emits an electron and an electron antineutrino, thus causing the atomic number of the nucleus to increase by one while its mass number remains the same. Therefore, the new nucleus after the decay is
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