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which element has 17 protons in its nucleus
element with 17 protons
which element has 18 protons
element with 17 protons and 18 neutrons
which element has 19 protons
what atom has 17 protons
element with 17 protons and 20 neutrons
which element has 16 protons
which element has 14 protons
which element has seven protons
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