Still have questions? Oxidation number (also called oxidation state) is a measure of the degree of oxidation of an atom in a substance (see: Rules for assigning oxidation numbers). Oxidation Number. The oxidation number for all atoms in elemental state is 0. Molecular Weight 701.90. Source(s): Taken 2 years high school chem, 2 semesters college. In the complex [Co(en)2Cl2 ]Br, the co-ordination number and oxidation state of cobalt are : asked Oct 11, 2019 in Co-ordinations compound by KumarManish ( â¦ If an atom gains electron, the oxidation number is negative; if it looses electrons then the oxidation number is positive and if its octet is complete, oxidation number is zero. For example, in the [PtCl 6] 2-ion, each chloride ion has an oxidation number of â1, so the oxidation number of Pt must be +4. Chloride which is an unindented ligand is of two in number hence 1 X 2 = 2. This is because, oxidation number means that the number of electrons of either lost or gained by an atom of an element during compound formation. Get your answers by asking now. 10 years ago. Maria. Since chlorine is present in the elemental form, its oxidation number is zero. Oxidation Number Calculator is a free online tool that displays the oxidation number of the given chemical compound. Favorite Answer. Cl oxidation number is always -1 so based on that we can say the chlorine in this molecule has an oxidation number of (-1)4. then we deal with the hydrogen, since we already know that hydrogen is not bonded as a hydrate ( bonded directly to a metal) its oxidation state will be positive so . Beilstein/REAXYS Number 4935975. #d^6# configuration, whose formula is #[Co(en)_2Br_2]^(+)#, not as quoted in your question. MDL number MFCD00009593. ; When oxygen is part of a peroxide, its oxidation number is -1. Relevance. thanks for any help. CAS Number 13965-03-2. cisplatin - (Pt(NH3)2Cl2) How would I work out the oxidation number of Pt in cisplatin? EC Number 237-744-2. Answer Save. There are a few exceptions to this rule: When oxygen is in its elemental state (O 2), its oxidation number is 0, as is the case for all elemental atoms. Linear Formula [ (C6H5)3P]2PdCl2. PubChem Substance ID 24852524. Ethylenediamine which is bidentate ligand is of two in number hence 2X2 =4. Assign an oxidation number of -2 to oxygen (with exceptions). 3 0. Hence co-ordination number of Platinum will be 4 + 2 = 6 Oxidation state of Pt: Charge on complex = 0. It's 0. Ethylenediamine is a bidentate ligand; it has 2 donor atoms to coordinate to the metal centre in a 5-membered chelate ring. In almost all cases, oxygen atoms have oxidation numbers of -2. Hence, [x + (0 X 2) + ( -1 X 2)] = 0 in 2Cl2, what is the oxidation number of Chlorine? 1 Answer. 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