Ca & Mg
Fluorine. Oxygen has a -2 oxidation number in all compounds except peroxides and compunds with fluorine (+1 or +2)
Positive oxidation numbers are most common with the metals - groups 1 to 13. However there are many well known compounds where non-metals have positive oxidation numbers- for example NaClO4 where Cl has an oxidation number of +7
The oxidation number of F, or Fluorine, is F-1. Since it is in the seventh group on the periodic table, it has seven valence electrons. It needs to get eight valence electrons to be stable, so it will gain one electron.
An element exhibits a positive oxidation state when it is bonded to a more electronegative element. Fluorine is the most electronegative of all the elements. But what if fluorine bonds with extremely elecronegative oxygen and nitrogen ligands like -OCF3, -OTeF5, -OIO2F2, -N(SO2CF3)2, -N3, -N5(pentazole ligand) etc.? eg: F-OTeF5
Elements with positive oxidation numbers have excess electrons that they can share or transfer with elements having negative oxidation numbers that have electron deficiencies. This transfer or sharing of electrons allows the elements to achieve a more stable electron configuration, forming compounds through the formation of ionic or covalent bonds.
An atom of fluorine has the greatest attraction among all atoms for electrons; therefore, no other atom can extract an electron from a fluorine atom, as would be required for the fluorine to have a positive oxidation state.
Fluorine. Oxygen has a -2 oxidation number in all compounds except peroxides and compunds with fluorine (+1 or +2)
Positive oxidation numbers are most common with the metals - groups 1 to 13. However there are many well known compounds where non-metals have positive oxidation numbers- for example NaClO4 where Cl has an oxidation number of +7
The oxidation number of F, or Fluorine, is F-1. Since it is in the seventh group on the periodic table, it has seven valence electrons. It needs to get eight valence electrons to be stable, so it will gain one electron.
An element exhibits a positive oxidation state when it is bonded to a more electronegative element. Fluorine is the most electronegative of all the elements. But what if fluorine bonds with extremely elecronegative oxygen and nitrogen ligands like -OCF3, -OTeF5, -OIO2F2, -N(SO2CF3)2, -N3, -N5(pentazole ligand) etc.? eg: F-OTeF5
Some examples of elements that commonly form cations with positive oxidation states include alkali metals such as sodium (Na+) and potassium (K+), alkaline earth metals such as magnesium (Mg2+) and calcium (Ca2+), and transition metals like iron (Fe3+) and copper (Cu+).
Elements with positive oxidation number easily combined with those having a negative oxidation number because opposite oxidation number attracts each other.
Elements with positive oxidation numbers have excess electrons that they can share or transfer with elements having negative oxidation numbers that have electron deficiencies. This transfer or sharing of electrons allows the elements to achieve a more stable electron configuration, forming compounds through the formation of ionic or covalent bonds.
In compounds, magnesium has a +2 oxidation state; in most but not quite all compounds, oxygen has a -2 oxidation state. In peroxides, oxygen has a -1 oxidation state. In oxygen fluorides, oxygen has positive oxidation states.
The oxidation number of magnesium in MgO is +2. Magnesium typically forms ions with a +2 charge, while oxygen typically forms ions with a -2 charge. In MgO, the overall charge of the compound is neutral, so the oxidation number of magnesium must be +2 to balance the -2 charge of oxygen.
Chlorine has 7 valence electrons and requires one more electron to complete the octet. Hence it has an oxidation number of -1. But, it should be noted that chlorine show positive oxidation numbers (up to +7) also in its compounds
Manganese is a metal element. It shows the largest oxidation number.