Stable artificial elements have a number {magic number} of protons or neutrons. Some {doubly magic isotope} have special numbers of both protons and neutrons. Lead-208 has 82 protons and 126 neutrons and is doubly magic. Elements 114, 120, or 126 can be doubly magic, with 184 neutrons.
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5-Physics-Matter-Atom-Periodic Table
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Date Modified: 2022.0224