A positron is emitted in .
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A.
beta-plus decay
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B.
beta-negative decay
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C.
alpha decay
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D.
gamma decay
Correct Answer:
A. beta-plus decay
Explanation:
A positron is emitted during beta-plus decay, a process where a proton within an unstable, proton-rich nucleus transforms into a neutron. To maintain charge conservation, the nucleus releases a neutrino and a positron, which is the antimatter counterpart of an electron with an equivalent mass but a positive charge. Consequently, the resulting daughter nucleus retains the same mass number as the parent but possesses an atomic number that is reduced by one unit.
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