The last of these compounds shows an amazing property when hydrated. Its colour changes between pale green, dark green and violet depending on how many of the chromium ion's six coordination sites are ...

Adopting potassium-ion batteries for stationary storage purposes ... the researchers show how their naturally-conductive ...

O\) Complex ion-electron equations can be written if ... hydrogen ions), while the right hand side is 6+ (from the two chromium ions). The charge can be balanced by adding electrons to the left ...