Indium

Indium is a chemical element with the symbol In and atomic number 49. It is a post-transition metallic element that is rare in Earth's crust. The metal is very soft, malleable and easily fusible, with a melting point higher than sodium, but lower than lithium or tin.

Chemical Properties

Indium has a bright silvery-white color and it is both soft and malleable. It is stable in air and water but dissolves in acids. Chemically, it is largely similar to gallium and thallium and it largely forms only trivalent In3+ ions. These compounds are often blue or violet due to this ion's strong tendency to form coordination complexes.

Physical Properties

Indium is a silvery-white, highly ductile post-transition metal with a bright luster. It is so soft (Mohs hardness 1.2) that like sodium, it can be cut with a knife. It also leaves a visible line on paper.

Uses

Indium is used in the production of low-melting alloys. It is also used in some dental applications and in the production of certain semiconductors.

Health Effects

Exposure to indium can have adverse health effects. Inhaling indium can cause lung damage and skin contact can result in skin irritation.

See Also

• Chemical Elements
• Metals
• Chemical Properties
• Physical Properties

References

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