Iodine

Symbol IAtomic number 53
Atomic mass
126.904
Thermal conductivity
0.00449
Atomic radius
1.32
Covalent radius
1.33
Density
4.92
Atomic volume
25.74
Melting point
386.7
Oxidation states
+/-1,5,7
Boiling point
458.4
Stable isotopes
1
Heat of vapor.
20.752
Electronegativity
2.66
Heat of fusion
7.824
First ionization
10.451
Specific heat
0.214
Electrical conduct.
...
Electron configuration

General descriptionNuclear data
Index

Periodic Table

Chemistry concepts
 
HyperPhysicsR Nave
Go Back





Iodine

Iodine in pure form is an almost black crystalline solid with a slightly metallic lustre. Warmed gently, it gives off a dense, beautiful blue-violet vapor of diatomic iodine. It exhibits a similar blue-violet color in solution in chloroform, carbon tetrachloride, and carbon disulfide, suggesting that it molecular form is maintained in such solutions.

Iodine occurs as iodide ion in very small quantities in sea water. In Chile saltpeter it occurs as a small amount of sodium iodate, NaIO3. Most of its commercial sources come from the saltpeter. Iodine can also be obtained from kelp, which concentrates it from sea water. The concentrated brines brought up from oil wells also provide a source.

Iodine in solution in alcohol is called tincture of iodine, and is used as a topical antiseptic. Its different color, reddish brown, indicates a form different from I2.

Hydrogen iodide, HI, is a colorless gas and its solution in water forms a strong acid, hydroiodic acid.

Atomic dataNuclear data
Index

Periodic Table

Chemistry concepts

Reference
Pauling
Ch. 13
 
HyperPhysicsR Nave
Go Back







Iodine Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
53
125
124.904620
116.3218
1056.3
5/2
...
59.9d
b-
0.18
53
127
126.904473
118.1846
1072.6
5/2
1.00
stable
...
...
53
129
128.904986
120.0481
1088.3
7/2
...
17My
b-
0.19
Atomic data
Index

Periodic Table

Chemistry concepts

Reference
Rohlf
 
HyperPhysicsR Nave
Go Back