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Which mode of decay dominates when neutron excess is high in a heavy, unstable nucleus?

A)Beta-minus emission
B)Alpha particle emission
C)Spontaneous fission
D)Electron capture decay

💡 Explanation

Beta-minus decay converts a neutron to a proton, reducing neutron excess via Weak interaction rather than alternatives involving only nucleons. Therefore, beta-minus emission dominates because it corrects the neutron-proton imbalance directly, rather than spontaneous fission.

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