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SmartWish
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Fluorine is in group seven, hence seven outer electrons

SmartWish
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2s2 + 2p5 = 2+5=7

nincompoop
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AriPotta
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wat. SORCERY

SmartWish
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Just remember that looking up the group (almost) only works for elements up to about atomic number 20

AriPotta
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i don't think so. thanks again :]