+1 for Na
-1 for Cl
The chlorine in PbCl2 exists as chloride ions, and the oxidation number of chloride ions is always -1.
The oxidation number of the ammonium ion is +I.
-1 for each Cl, +2 for Sn
A metal and a nonmetal would form an ionic bond. In an ionic compound, a metal ion would have a positive oxidation number equal to its ionic charge. A nonmetal would have a negative oxidation number equal to its ionic charge.Examples:NaCl oxidation numbers: sodium has an oxidation number of +1, chloride has an oxidation number of -1. So the overall charge of NaCl is zero.CaCl2 oxidation numbers: calcium has an oxidation number of +2, the chloride ion has an oxidation of -1. Since there are two chloride ions, the total negative oxidation number is -2, so CaCl2 has an overall charge of zero.
+3 for Fe, -1 for Cl
-2 oxidation state
The oxidation numbers of atomic magnesium and atomic chlorine are 0. They react with each other to form magnesium chloride. After the formation of the salt, magnesium ions have +2 oxidation number where that of chloride ions is -1.
+3 for Al, -1 for each Cl
It contains only two elements. Fe shows +3 number. Chlorine shows -1 as the oxidation number.
There are two Iron chlorides. Iron(II) chloride, in which iron is in +2 oxidation state, and Iron(III) chloride, in which iron is in +3 oxidation state.
The oxidation number of chlorine is -1 in most states but it can be altered in certain compounds.
It contains two elements. Na shows +1. chlorine shows -1 oxidation number.