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the atoms of a certain element contain 9 protons and 7 valence electrons which statement correctly identifies this element and describes its chemical reactivity
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the atoms of a certain element contain 9 protons and 7 valence electrons which statement correctly identifies this element and describes its chemical reactivity

User Dogfish
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This element is fluorine, F. It is quite reactive, this is because it wants to reach a full shell of valence electrons. It is electronegative and small as there is quite an attraction for electrons making it smaller.
User Naning
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