Scandium iodide can be added to mercury vapor lamps so that they will emit light that closely resembles sunlight.
Only Scandium iodide (or if you want scandium triiodide), ScI3.
Scandium is present in most of the deposits of rare earth and uranium compounds, but it costs expressed from these ores in only a few mines worldwide. Because of the low availability and the difficulties in the preparation of metallic scandium, which was first base neutralized 1937, it took until the 1970s before applications for scandium were formulated. The incontrovertible effectuates of scandium on aluminium alloys were discovered in the 1970s, and its use in such alloys persists they're lone major application. The pure element is relatively stable in air in bulk form, due to passivation resulting from the formation of a protective oxide (Y2O3) film on its surface. This film can reach a thickness of 10 µm when yttrium is heated to 750 °C in water vapor. When finely divided, however, yttrium is very unstable in air; shavings or turnings of the metal can ignite in air at temperatures exceeding 400 °C .
The properties of scandium compounds are intermediate between those of aluminium and yttrium. A diagonal relationship exists between the behavior of magnesium and scandium, just as there is between beryllium and aluminium. In the chemical compounds of the elements shown as group 3, above, the predominant oxidation state is +3.
Yttrium is the first d-block element in the fifth period.
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