A radioactive isotope with an atomic number of 90 undergoes beta decay. What is the atomic number of the daughter nucleus?

Name: A radioactive isotope with an atomic number of 90 undergoes beta decay. What is the atomic number of the daughter nucleus?
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Question

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During beta decay, a neutron in an atom's nucleus is transformed into a proton, causing the atomic number to increase by 1. Since the original atomic number is 90, after beta decay, the atomic number becomes 91.

A Radioactive Isotope with an Atomic Number of 90 Undergoes