Atomic NumberAtomic Number of Iodine
Atomic Number of Iodine is 53.
Chemical symbol for Iodine is I. Number of protons in Iodine is 53. Atomic weight of Iodine is 126.90447 u or g/mol. Melting point of Iodine is 113,5 °C and its the boiling point is 184,4 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Iodine
Iodine is a chemical element which usually is presented as dark crystals with violet tint. Thus, its name comes from the Greek word meaning violet. Iodine belongs to the group of so called halogens (along with fluorine, chlorine, and other elements). This chemical element has high biological importance and is essential for normal function of our body, especially thyroid gland. Plenty of iodine can be found in seafood and especially seaweed where the most of iodine is obtained from. Iodine can also be found in some minerals. In many countries, iodine is added to table salt (in small doses) in order to prevent its deficiency. This element forms compounds with other elements like potassium, copper, sodium, etc. Commercial uses of iodine include photography, pharmacology, chemical industry, animal feed supplements, LCD displays, and disinfectants.
Uses of Iodine
Iodine, a chemical element with the symbol I, is used to treat goitre and thyroid cancer in medicine. It is especially employed in various organoiodine compounds. Some iodine compounds are employed in diagnostic radiology, in photography, and in analytical chemistry. Iodine compounds are mostly used as catalysts. They also exploited as disinfectant, antiseptics, stabilisers, dyes, pigments, animal feed supplements, etc. Silver iodide, a compound with the formula AgI, is used in silver-based photography and cloud seeding. It can be used as an antiseptic too. Iodised salt is used as an iodine supplement. To add small amounts of iodine to the sodium chloride salt can prevent iodine deficiency.
Compounds with Iodine
- NaIO3: Sodium iodate
- Ca(IO3)2: Calcium iodate
- CHI3: Iodoform
- AgI: Silver iodide
- KI: Potassium iodide
- HI: Hydrogen iodide
- ISCN: Iodine thiocyanate
- IN3: Iodine azide
- ICN: Cyanogen iodide
- IBr: Iodine monobromide
- IF: Iodine monofluoride
- HIO3: Iodic acid
- HIO2: Iodous acid
- HIO: Hypoiodous acid
- PhICl2: Iodobenzene dichloride
- K2HgI4: Potassium tetraiodomercurate(II)
Properties of Iodine Element
| Atomic Number (Z) | 53 |
|---|---|
| Atomic Symbol | I |
| Group | 17 |
| Period | 5 |
| Atomic Weight | 126.90447 u |
| Density | 4.93 g/cm3 |
| Melting Point (K) | 386.85 K |
| Melting Point (℃) | 113,5 °C |
| Boiling Point (K) | 457.4 K |
| Boiling Point (℃) | 184,4 °C |
| Heat Capacity | 0.214 J/g · K |
| Abundance | 0.45 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Halogen |
| Electronegativity (Pauling) χ | 2.66 |
| Ionization Energy (eV) | 10.45126 |
| Atomic Radius | 140pm |
| Covalent Radius | 133pm |
| Van der Waals Radius | 198 |
| Valence Electrons | 7 |
| Year of Discovery | 1811 |
| Discoverer | Courtois |