NO. 049Post-Transition

In

Indium

Indium is a soft metal used in touchscreens, semiconductors, and low-melting alloys.

Crystal Structure

Tetragonal

Atomic Mass114.82 u

Density7.31 g/cm³

Melting Point430 K

Boiling Point2345 K

Atomic Radius156 pm

Electronegativity1.78

Ionization Energy558 kJ/mol

Electron Affinity29 kJ/mol

Bonding TypeMetallic

Oxidation States1, 3

Acid/BaseCan act as acid or base

ReactivityLow

Electron Configuration

[Kr] 4d10 5s2 5p1

Discovered ByFerdinand Reich

Year1863

Known Isotopes

In-113In-115