Final answer:
An alpha particle is a high-energy particle equivalent to a helium nucleus made of two protons and two neutrons, with low penetration power.
Explanation:
An alpha particle is a high-energy particle that consists of two protons and two neutrons bound together. It is equivalent to a helium nucleus, represented as He2+. Alpha particles have low penetration power, meaning they can be stopped by a thin barrier like paper or skin.
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