-2 for O, +3 for Bi
The oxidation number of bismuth in Bi2O3 is +3. In the compound Bi2O3, oxygen has an oxidation number of -2 (since it is in its standard state), so the oxidation number of bismuth must be +3 to balance the charge.
The oxidation number of Bi in Bi2O3 is +3, as each oxygen atom has an oxidation number of -2. This makes the total negative charge from the oxygen atoms -6, which is balanced by the positive charge of +3 on the bismuth atom.
The chemical formula for bismuth oxide is Bi2O3.
decomposition
Trevor Edward Crumpton has written: 'Characterisation of new phases synthesised by incorporating S,W,Mo, Cr, and Re oxoanions into Bi2O3'
Yes, during oxidation, the oxidation number of the substance increases. This is because oxidation involves the loss of electrons, leading to an increase in the oxidation number.
Bismuth is in group 5, meaning that it has 5 electrons in its outer shell (thus it has 3 gaps). Oxygen is in group 6, meaning that it has 6 electrons in its outer shell (thus it has 2 gaps). Since both are Non-metals, they use covalent bonding. By doing so they form Bi2O3 rather than the larger molecule you describe. Covalent bonding would make it impossible for the two extra oxygens to join the molecule. These two extra oxygens would instead form O2. In the example I gave the Bismuth molecules had 6 gaps and so did the oxygen molecules so covalent bonding left the molecule with no gaps. Atoms want to be in balance so the example I gave would be how the atom would want to be.
Oxidation number is oxidation states of an element. It can be positive or negative.
Tungsten oxide (WO3) and bismuth trioxide (Bi2O3) are examples of oxides that do not react with either hydrochloric acid or aqueous sodium hydroxide.
For HClO oxidation No. is '0' . It is a neutrally charged molecule. However, The chlorine atom is in oxidation state (+1). How so???? you may ask . Using oxygen as that standard at '-2' , and hydrogen at '+1' We create a little sum +1 + Cl -2 = 0 ( overall charge on the molecule). Collecting terms Cl - 1 = 0 Cl = + 1 as required. NB When dissolved in water chlorine disproportionates. That is it simultaneously oxidises and reduces., Cl2(aq) = Cl^(+)(aq) + Cl^(-)(aq) It reacts with water molecules to form ;- Cl2 + H2O = HClO + HCl The supply of drinking water from public sources has chlorine bubbled through to act as a bacteriocide (kill the bugs). So tap/faucet water is a very weak solution of hydrochloric acid(HCl) and Hydrogen chlorate(bleach)(HClO). It won't harm you, because the solution is so weak, but just enough to kill the bugs.
S = +4 oxidation state O = -2 oxidation state
The oxidation number of nitrosyl (NO) is +1. Nitrogen typically has an oxidation number of -3, and oxygen typically has an oxidation number of -2. In NO, nitrogen has a -3 oxidation number and oxygen has a -2 oxidation number, leading to an overall oxidation number of +1 for the nitrosyl ion.