Symbol	In
Atomnummer	49
Gruppe	13 (Borgruppe)
Periode	5
Blok	p
Klassifikation	Andre metaller

Udseende	Silvery lustrous gray
Farve	Sølv

Antal protoner	49 p+
Antal neutroner	66 n0
Antal elektroner	49 e-

Fra Wikipedia, den gratis encyklopædiIndium er et grundstof med atomnummer 49 og kemiske symbol In i det periodiske system. Dette sjældne, bløde metal har en høj duktilitet (strækbar) og indgår let i kemiske forbindelser. Kemisk kan det ligne aluminium eller gallium, men er i højere grad i familie med zink. Zinkmalm er den primære kilde til indium. Indium benyttes primært til at lave transparente elektroder af indium-tin-oxid i LCD skærme.

Fase ved STP	Fast
Massefylde	7.31 g/cm3
Atommasse	114.818 u

Smeltepunkt	429.749 K 156.599 °C 313.8782 °F
Kogepunkt	2345 K 2071.85 °C 3761.33 °F
Fordampningsvarme	226.35 kJ/mol

Elektronegativitet (Pauling Scale)	1.78
Elektronaffinitet	37.043 kJ/mol
Oxidationstrin	−5, −2, −1, +1, +2, +3 (an amphoteric oxide)
Ioniseringsenergier	558.3 kJ/mol 1820.7 kJ/mol 2704 kJ/mol 5210 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Kr] 4d10 5s2 5p1
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p1
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p1
Elektroner pr. Skal	2, 8, 18, 18, 3
Valenselektroner	3
Valency-elektroner	3
Bohrs atommodel	Figur: Skaldiagram af Indium (In) atom.
Orbital diagram	1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p

Opdaget	Ferdinand Reich, Hieronymous Theodor Richter (1863)
Første isolation	Hieronymous Theodor Richter (1864)
Opdagelse af indium In 1863, the German chemists Ferdinand Reich and Hieronymous Theodor Richter were testing ores from the mines around Freiberg, Saxony. They dissolved the minerals pyrite, arsenopyrite, galena and sphalerite in hydrochloric acid and distilled raw zinc chloride. Reich, who was color-blind, employed Richter as an assistant for detecting the colored spectral lines. Knowing that ores from that region sometimes contain thallium, they searched for the green thallium emission spectrum lines. Instead, they found a bright blue line. Because that blue line did not match any known element, they hypothesized a new element was present in the minerals. They named the element indium, from the indigo color seen in its spectrum, after the Latin indicum, meaning 'of India'. Richter went on to isolate the metal in 1864. An ingot of 0.5 kg (1.1 lb) was presented at the World Fair 1867. Reich and Richter later fell out when the latter claimed to be the sole discoverer.

CAS Number	7440-74-6
ChemSpider ID	4514408
EC number	231-180-0
PubChem CID Number	5359967