Indium (In)

Indium is a chemical element with symbol In and atomic number 49. It is a post-transition metal that makes up 0.21 parts per million of the Earth's crust.

Atomic Number

49

Atomic Mass

114.82 u

Category

post transition

Phase

solid

Density

7.31 g/cm³

Electron Shells

2, 8, 18, 18, 3

Atomic Structure

Protons: 49 • Electrons: 49 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p¹

Discovery

1863 • Ferdinand Reich, Hieronymous Theodor Richter