Indium is a metallic chemical element belonging to group 13 and period 5 of the periodic table of elements. With atomic symbol In and atomic number 49, indium has 13 known isotopes, with an atomic mass varying between 121 and 133. It has a relative atomic weight of 114.82.

Indium has a melting point of 156.60°C and a boiling point of 2072°C. It has a relative density of 7.29 g/cm3 and an oxidation state of +3. Its color is greyish-white when pure, but it takes on a reddish color when heated.

Indium is primarily used to create alloys for industrial uses. It can be added to steel to make it more corrosion-resistant. It is also used to produce alloys with tin, which is useful in electronics and electronic devices. In addition, indium also plays an important role in the manufacture of electronic components.

Besides these industrial uses, indium is also used to produce refractory materials for thermal insulation. It is also used in solar cells and sensors. Finally, it is used to produce non-stick coatings for kitchen utensils.

156.2°
2080°

114.818

1
2
3

[Kr] 4d10 5s2 5p1

2
8
18
18
3

1.78

5.7864

Synthetic

Radioactive

Liquid

Gaseous

Electronic configuration diagram

Characteristics

Name	Indium
Number	49
Atomic	114.818
Symbol	In
Fusion	156.2
Boiling	2080
Density	7.31
Period	5
Group	13

Discovery	1863 Reich and Richter
Abundance	0.25
Radius	2
Electronegativity	1.78
Ionization	5.7864
Number of isotopes	34
Electronic configuration	[Kr] 4d10 5s2 5p1
Oxidation states	1,2,3
Electron by energy level	2,8,18,18,3

Minerals containing this element : 15

Mineral	Hardness	Density
Abramovite
Cadmoindite
Damiaoite	5.00 / 5.00	10.95
Dzhalindite	4.00 / 4.50	4.34
Indite	5.00 / 5.00	4.67
Indium	3.50 / 3.50	7.20
Ishiharaite
Kudriavite		6.58
Laforêtite	3.00 / 3.00	4.93
Petrukite	4.50 / 4.50	4.61
Roquesite	3.50 / 4.00	4.00
Sakuraiite	4.00 / 4.00	4.00
Yanomamite	5.50 / 6.00	3.87
Yixunite	6.00 / 6.00	18.21
Znamenskyite