Cobalt: Difference between revisions

Cobalt is a [[transition metal]]. It is shiny and conducts electricity. It is [[magnet]]ic. It is a hard metal. It is moderately [[chemical reaction|reactive]]. [[Iron]] is more reactive and [[copper]] is less reactive. It dissolves slowly in [[acid]]s. This reaction makes [[hydrogen]] and a [[salt]] of cobalt. Cobalt is normally in its +2 [[oxidation state]] as an [[ion]]. Some [[chemical compound]]s conwdsataincontain cobalt ions in its +4 oxidation state. [[Cobalt(II) chloride]] is one of the most common cobalt compounds. Many cobalt compounds are blue or pink. One of them is black.