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1、你所需要标的的原子正上方,如果是负价就-x,如果是正价就+x,常见元素化合价表:原子团化合价:硝酸根NO3:-1锰酸根MnO4:-2亚硫酸根SO3:-2亚硫酸氢根HSO3:-1硫酸根SO4:-2O4-8,S+6.碳酸根CO3:-2O3-6,C+4.氯酸根ClO3:-1O3-6,Cl+5.氢氧根OH:-1O-2,H+1.铵根NH4:+1H4+4,N-3.磷酸根PO4:-3O4-8,P+5碳酸氢根HCO3:-1高锰酸根MnO4::-1元素化合价:1H:1Li,Na,K,Rb,Cs:1Cu,Ag:1,2,3Au:1,32Be,Mg,Ca,Zn,Sr,Cd,Ba,Ra:2Hg:1,2
2、3B,Al,Sc,Ga,Y,La,Pr-Lu,Ac:3In,Tl:1,34C,Si,Ge,Sn,Pb:2,4Ti,Zr:2,3,4Ce,Hf,Th:3,45N:-3,1,2,3,4,5P:-3,1,3,4,5As,Sb:-3,3,5Bi:3,5V,Nb,Ta:2,3,4,5Pa:3,4,56O:-2,-1,2S,Se,Te:-2,2,4,6Po:2,4,6Cr:2,3,6Mo,W:2,3,4,5,6U:3,4,5,67F:-1Cl:-1,1,3,4,5,6,7Br,I:-1,1,3,5,7Mn:2,3,4,6,7Tc,Re:4,5,6,7Np,Pu:3,4,5,6,78Xe:
3、1,4,6,8Ru:2,3,4,5,6,7,8Fe,Os:2,3,4,5,6,8Co,Ni,Pd:2,3,4RhIr,Pt:2,3,4,5,6