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Which outcome occurs when an unstable isotope undergoes beta decay?

A)Atomic number increases; mass unchanged
B)Atomic number decreases; mass unchanged
C)Neutron number decreases; atomic increases
D)Proton emission rate greatly increases

💡 Explanation

When beta decay occurs, a neutron transforms into a proton and electron due to the weak interaction. This increases the atomic number because there is an additional proton, therefore the new element has slightly different physical properties, rather than an atomic mass change.

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