(1)酸性:H3PO4_____H2SO4,碱性:KOH_____Mg(OH)2;
(2)氧化性:Cl2_____S,还原性:Cl-_____Br-;
(3)稳定性:CH4_____HF;
(4)微粒半径:Si_____Na;F-_____Na+
(5)电子数目:H2O_____CH4
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