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element with 51 protons and 72 neutrons
element with 51 protons
element with 51 neutrons
what element has 51 protons
element that has 51 protons
element with 53 protons and 74 neutrons
what element has 51 neutrons
element with 17 protons and 20 neutrons
which element has 53 protons 74 neutrons
element with 19 protons and 20 neutrons
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