Iodine is a metalloid chemical element belonging to the halogen family and occurring in solid form of an intense violet.

- iodine is an extremely reactive halogen. It combines with many other chemical elements and forms volatile molecules.
- It also combines with hydrogen to form a liquid compound at low temperatures called hydriodic acid.
- It is very soluble in water and dissolves to form iodide ions.

- iodine has many uses, including in x-rays, wastewater treatment to remove chlorine and bromides, and the manufacture of chemicals, such as antiseptics, drugs, and dyes.
- It is also used in the treatment of certain forms of cancer and in the production of radiopharmaceuticals for medical diagnostic examinations.
- iodine is also used in the production of radioactive iodine, which is used in applications such as radio-imaging and cancer treatment.

113.5°
184.4°

126.90447

-1
1
3
5
7

[Kr] 4d10 5s2 5p5

2
8
18
18
7

2.66

10.4513

Synthetic

Radioactive

Liquid

Gaseous

Electronic configuration diagram

Characteristics

Name	Iodine
Number	53
Atomic	126.90447
Symbol	I
Fusion	113.5
Boiling	184.4
Density	4.93
Period	5
Group	17

Discovery	1811 Courtois
Abundance	0.45
Radius	1.3
Electronegativity	2.66
Ionization	10.4513
Number of isotopes	24
Electronic configuration	[Kr] 4d10 5s2 5p5
Oxidation states	-1,1,3,5,7
Electron by energy level	2,8,18,18,7

Minerals containing this element : 30

Mineral	Hardness	Density
Aurivilliusite		8.96
Bellingerite	4.00 / 4.00	4.89
Bluebellite	1.00 / 1.00	4.75
Brüggenite	3.50 / 3.50	4.24
Capgaronnite		6.19
Carlosruizite	2.50 / 3.00	3.42
Coccinite	2.00 / 2.00	6.00
Demicheleite-(Br)
Demicheleite-(I)
Dietzeite	3.50 / 3.50	3.62
Fuenzalidaite	2.50 / 3.00	3.31
George-ericksenite	3.00 / 4.00	3.04
Grechishchevite	2.50 / 2.50	7.16
Hectorfloresite	2.00 / 2.00	2.80
Iodargyrite	1.50 / 2.00	5.50
Iodine
Lautarite	3.50 / 4.00	4.52
Marshite	2.50 / 2.50	5.60
Miersite	2.50 / 3.00	5.64
Moschelite	1.50 / 2.00	7.00
Mutnovskite	2.00 / 2.00	6.18
Nataliyamalikite
Perroudite	2.00 / 2.00
Radtkeite	2.00 / 3.00	7.00
Salesite	3.00 / 3.00	4.77
Schwartzembergite	2.50 / 2.50	7.39
Seeligerite		6.83
Tedhadleyite	2.50 / 2.50
Tocornalite	1.00 / 2.00
Vasilyevite	3.00 / 3.00	9.57