单项选择题
A.F B.Cl C.Br D.I
A.Na+:1s22s22p6 B.F:1s22s22p5 C.O2—:1s22s22p4 D.Ar:1s22s22p63s23p6
A.+1 B.+2 C.+3 D.-1
A.道尔顿 B.卢瑟福 C.汤姆生 D.波尔
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