You are here

Iodine Element in Periodic Table | Atomic Number Atomic Mass


Iodine Element:

Iodine is the chemical element and it is represented by the symbol I and its atomic number is 53. In the periodic table it is a p-block element and it is a member of the 17th period and is placed in group 5. It exists as a lustrous purple-black non-metal that is solid under standard conditions of temperature and pressure. It is mostly found in seawater, as iodide. Iodine has 37 known isotopes of iodine, only one occurs in nature, 127iodine. The others are radioactive with half-lives too short to be primordial.

Uses Of Iodine Element:

  • Today, iodine has many commercial uses. Iodide salts are used in many pharmaceuticals. Iodised edible salt is an essential additive in culinary preparations.
  • Iodine is used in manufacture of disinfectants.
  • It  is necessary in making certain printing-inks and dyes.
  • Iodine compounds are useful as catalysts in certain chemical reactions.
  • It is used in production of animal feed supplements.
  • Iodine is an important ingredient in photographic chemicals. Iodine is also used to make polarising filters for LCD displays.
  • It is essential in the synthesis of thyroid hormones. Deficiency of iodine can lead to serious health problems including the swell-up of thyroid gland resulting in goitre. Adequacy of iodine in human body is invariably emphasised by medical doctors as well as dietitians.


Iodine Element Information:

Discovery year: 1811

Discovered by: Bernard Courtois

Atomic number: 53

Relative atomic mass: 126.904 

Electron configuration: [Kr] 4d10 5s2 5p5

Block: p-block

Other elements in the same block:

Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton, Indium, Tin, Antimony, Tellurium, Xenon, Thallium, Lead, Bismuth, Polonium, Astatine, Radon, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson are the same block elements.

Period: period 5

Other elements in the same period:

Rubidium, Strontium, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, Indium, Tin, Antimony, Tellurium and Xenon are the elements in the same period.

Group: group 17 (halogens)

Other elements in the same group:

Fluorine, Chlorine, Bromine, Astatine and Tennessine are the same group elements.

Other elements in the same orbital:

Indium, Tin, Antimony, Tellurium and Xenon are the elements in the same orbital.

Allotropes: none

Key isotopes: 127

Melting point: 113.7°C, 236.7°F, 386.9 K

Boiling point: 184.4°C, 363.9°F, 457.6 K

Element category:  diatomic non-metal

Density (g cm−3): 4.933

CAS number: 7553-56-2 

Color: lustrous metallic gray, violet as a gas

You can know detailed information for each element,

Hydrogen, HeliumLithiumBerylliumBoronCarbonNitrogenOxygenFluorine,  Neon , SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon, PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromine, Krypton,  Rubidium, StrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodine, Xenon,  Caesium, BariumLanthanum,  CeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryThalliumLeadBismuthPoloniumAstatine, Radon,  Francium, RadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessine, Oganesson.

Add new comment

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
1 + 4 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.