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Atomic Nucleus
The dense region at the center of an atom, composed of protons and neutrons, around which electrons orbit.
Alpha Particle
A type of ionizing radiation made up of two protons and two neutrons, emitted by certain radioactive materials and can be harmful if ingested or inhaled.
Atomic Nucleus
The central core of an atom containing protons and neutrons, which accounts for most of the atom's mass.
Alpha Particle
A type of ionizing radiation consisting of two protons and two neutrons, equivalent to a helium-4 nucleus.
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