The manganese ions are in the +4 oxidation state.

This reaction is catalysed by a reactive centre in photosystem II containing four manganese ions.

It is a metallo-oxo cluster comprising four manganese ions (in oxidation states ranging from +3 to +5) and one divalent calcium ion.

It encodes a mitochondrial matrix protein that forms a homotetramer and binds one manganese ion per subunit.

Permanganate is an ion that contains one manganese ion in an oxidation state of +7 and 4 oxide atoms.

The interaction with sugars requires tightly bound calcium and manganese ions.

It can be used as a pink pigment or as a source of the manganese ion or iodide ion.

Depending on their oxidation state, manganese ions have various colors and are used industrially as pigments.

In biology, manganese(II) ions function as cofactors for a large variety of enzymes with many functions.