In alpha decay, alpha particles are ejected from the nucleus. Which equation represents alpha decay?

An alpha particle is a helium-4 nucleus, written as ⁴₂He. In alpha decay, the original nucleus loses 2 protons and 2 neutrons, so its atomic number decreases by 2 and its mass number decreases by 4. Choice D shows ²⁴¹₉₅Am becoming ²³⁷₉₃Np and emitting ⁴₂He, so it represents alpha decay.

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