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which element has 9 protons
which element has 9 protons and 10 neutrons
which element has 9 protons in its nucleus
which element has 19 protons
which element has 90 protons
which element has 8 protons
which element has 19 protons and 20 neutrons
which element has 8 protons in its nucleus
which element has 7 protons
which element has 7 protons and 8 neutrons
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