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Radioactivity

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Across
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The high-energy particles and electromagnetic radiation emitted by a radioactive substance
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High-frequency electromagnetic radiation emitted by radioactive elements
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Smallest unit into which matter can be divided and still retain the characteristic properties of an element
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Chemical compound in which one or more atoms have been replaced
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A unit of absorbed energy
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An electrically neutral subatomic particle of the atomic nucleus
Down
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Consist of two protons and two neutrons
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A electron released from a nucleus
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Radiation that carries enough energy to detach electrons from atoms or molecules.
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Form of electromagnetic radiation
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A positive electric charge
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A group of atoms bonded together