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element with 20 protons
element with 20 protons and 20 neutrons
element with 20 protons and 18 electrons
element with 20 protons and 27 neutrons
element with 19 protons and 20 neutrons
element with 17 protons and 20 neutrons
element with 25 protons
element with 10 protons
element with 12 protons
element with 21 protons
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