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element with 20 protons and 18 electrons
element with 20 protons and 20 neutrons
element has 19 protons and 18 electrons
atom with 20 protons and 18 electrons
what has 20 protons and 18 electrons
element with 20 protons
element with 12 protons and 10 electrons
element with 17 protons and 20 neutrons
element with 18 protons
element with 18 protons and 22 neutrons
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