what is metal au
Gold Facts 1 The gold ion in the +3 oxidation state (Au(III) 3+) is called the auric ion. 2  Compounds containing gold in the -1 oxidation state are called aurides. ( 3 Cesium and rubidium can form auride compounds). 4  Gold is one of the noble metals. 5  Noble metal is an alchemical term for metals that do not corrode under normal conditions.