Answer:
Alpha Decay
Explanation:
An alpha particle comprises two neutrons and two protons. Therefore, when an element undergoes alpha decay or beta decay, it loses mass, transforming into a different element and changing its position on the periodic table. For example, uranium-238, the most common isotope of uranium, with a half-life of 4.5 billion years, emits alpha particles to become thorium-234, as shown in the picture provided. (reduces the number of protons in the nucleus of an atom by 2)
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