VALENCES OF SOME COMMON MAIN GROUP IONS Cations Anions VALENCES OF SOME COMMON TRANSITION GROUP IONS *Mercury(I) is diatomic = Hg2+2 (each mercury ion has a +1 charge) +1 valence Li+1 = lithium Na+1 = sodium K+1 = potassium Rb+1 = rubidium Cs+1 = cesium 1 valence F-1 = fluoride Cl-1 = chloride Br-1 = bromide I-1 = iodide +2 valence Be+2 = beryllium Mg+2 = magnesium Ca+2 = calcium Sr+2 = strontium Ba+2 = barium Sn+2 = tin(II) Pb+2 = lead(II) 2 valence O-2 = oxide S-2 = sulfide +3 valence Al+3 = aluminum Ga+3 = gallium 3 valence N-3 = nitride P-3 = phosphide +4 valence Sn+4 = tin(IV) Pb+4 = lead (IV) Sc = +3 Ti = +2, +3, +4 V = +2, +3, +4, +5 Cr = +2, +3. +4, +5, +6 Mn = +2, +3, +4, +5, +6, +7 Fe = +2, +3, +4, +5, +6 Co = +2, +3 Ni = +2, +3, +4 Cu = +1, +2 Ag = +1 Zn = +2 Cd = +2 Hg = +1*, +2VALENCES OF SOME COMMON POLYATOMIC IONS Cation Anions Prefixes for Binary Molecular Compounds +1 valence NH4+1 = ammonium 1 valence C2H3O2-1 = acetate OH-1 = hydroxide HCO3-1 = bicarbonate (or hydrogen carbonate) ClO-1 = hypochlorite HSO4-1 = bisulfate (or hydrogen sulfate) NO3-1 = nitrate HSO3-1 = bisulfite (or hydrogen sulfite) NO2-1 = nitrite ClO3-1 = chlorate ClO4-1 = perchlorate CN-1 = cyanide MnO4-1 = permanganate 2 valence CO3-2 = carbonate SO4-2 = sulfate CrO4-2 = chromate SO3-2 = sulfite Cr2O7-2 = dichromate S2O3-2 = thiosulfate 3 valence PO4-3 = phosphate 1 = mono 4 = tetra 2 = di 5 = penta 3 = tri 6 =