Atomic Number of Iodine

Iodine Atomic Number

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 Year

About 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

Properties of Iodine Element

Atomic Number (Z)53
Atomic SymbolI
Atomic Weight126.90447 u
Density4.93 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 Capacity0.214 J/g · K
Abundance0.45 mg/kg
State at STPSolid
Electronegativity (Pauling) χ2.66
Ionization Energy (eV)10.45126
Atomic Radius140pm
Covalent Radius133pm
Van der Waals Radius198
Valence Electrons7
Year of Discovery1811

What is the Boiling Point of Iodine?

Iodine boiling point is 184,4 °C. Boiling point of Iodine in Kelvin is 457.4 K.

What is the Melting Point of Iodine?

Iodine melting point is 113,5 °C. Melting point of Iodine in Kelvin is 386.85 K.

How Abundant is Iodine?

Abundant value of Iodine is 0.45 mg/kg.

What is the State of Iodine at Standard Temperature and Pressure (STP)?

State of Iodine is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Iodine Discovered?

Iodine was discovered in 1811.