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polomer kationj mensi ako polomer atomu
kation odovzda e- preto je mensi a atom ho prijme cize je vacsi
polomer anionu vacsi ako polomer atomu
anion prijima a atom stráca e-
polomer kationu toho isteho atomu sa zmensuje s rastucim nabojom
Fe> Fe2+>Fe3+
najvacsi,mensi,najmensi je fe3+
velkost anionov v periode sa zmensuje s ratusim Z orvkov
7N ox.č: -3,
8O ox.č: -2
9F očx.č: -1 (halogen)