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element with 19 protons
element with 19 protons and 20 neutrons
element with 29 protons
element with 17 protons
element with 119 protons
element with 18 protons
element with 17 protons and 18 electrons
element with 17 protons and 20 neutrons
element with 17 protons and 18 neutrons
element with 29 protons in period 4
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