+1 for Na
-1 for Cl
The oxidation number of sodium in sodium chloride (NaCl) is +1, and the oxidation number of chloride is -1. Sodium tends to lose one electron to achieve a stable octet, giving it a +1 oxidation state, while chloride tends to gain one electron to achieve a stable octet, resulting in a -1 oxidation state.
Chlorine has an oxidation number of +1 in compounds with metals such as sodium chloride (NaCl) or potassium chloride (KCl).
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.
Chlorine is in group 17. It easily accepts an electron from another element to fill its valence shell. As it takes one electron, its oxidation number changes to -1.
The oxidation number of nitrogen in the ammonium ion NH4+ is -3, and the oxidation number of hydrogen is +1. In ammonium chloride NH4Cl, the net charge on NH4 is +1 because the chloride ion Cl- has an oxidation number of -1.
The oxidation number of sulfur in sodium bisulfate is +5. In bisulfate ion (HSO4-), the overall charge is -1, so the oxidation number of sulfur can be calculated as -1, taking into account the oxidation number of sodium as +1.
The oxidation number of sodium (Na) in sodium carbonate (Na2CO3) is +1. The oxidation number of oxygen (O) is -2, and the oxidation number of carbon (C) is +4. Therefore, the overall compound has a charge of 0.
The oxidation number for iron in ferric chloride (FeCl3) is +3. Chlorine has an oxidation number of -1, and since there are three chlorine atoms in ferric chloride, the overall charge must be balanced by the iron atom having an oxidation number of +3.
In sodium oxide (Na2O), sodium typically has an oxidation number of +1 and oxygen has an oxidation number of -2. Sodium readily gives up its outer electron to achieve a full valence shell, while oxygen typically gains two electrons to achieve a full valence shell.
The oxidation number of any monoatomic ion is equal to the charge of the ion. For example, the oxidation number of the sodium ion (Na+) is +1, and the oxidation number of the chloride ion (Cl-) is -1.
The oxidation number of aluminum in aluminum chloride (AlCl3) is +3. Aluminum typically has an oxidation number of +3 when it forms ionic compounds.
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