Iridium element (Ir) is in group 9 and period 6 of a periodic table. Iridium is in the d-block and it is classified as a transition element on the periodic table.
There is a lot more information related to iridium which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Iridium element (Information Table)
- Iridium element in Periodic table
- Facts about Iridium
- Properties of Iridium
- Uses of Iridium
Iridium Element (Information Table)
The important data related to iridium element is given in the table below.
|Appearance of iridium||Silvery white metallic surface|
|Atomic number of iridium||77|
|Symbol of iridium||Ir|
|Atomic mass of iridium||192.22 u|
|Protons, Neutrons & Electrons in iridium||Protons: 77, Neutrons: 115, Electrons: 77|
|State of iridium (at STP)||Solid|
|Group number of iridium in periodic table||9|
|Period number of iridium in periodic table||6|
|Block of iridium in periodic table||d-block|
|Category of iridium||Transition metals|
|Bohr model or Electrons per shell or Electrons arrangement in iridium||2, 8, 18, 32, 15, 2|
|Electron configuration of iridium||[Xe] 4f14 5d7 6s2|
|Orbital diagram of iridium|
|Electronegativity of iridium (on pauling scale)||2.2|
|Atomic radius of iridium (van der Waals radius)||202 picometers|
|Density of iridium||22.56 g/cm3|
|1st ionization energy of iridium||9.1 eV|
|Main isotope of iridium||193Ir|
|Melting point of iridium||2719 K or 2446 °C or 4435 °F|
|Boiling point of iridium||4403 K or 4130 °C or 7466 °F|
|Crystal structure of iridium||Face Centered Cubic (FCC)|
|Discovery of iridium||By Smithson Tennant in 1803|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Iridium element in Periodic table
The Iridium element (Ir) has the atomic number 77 and is located in group 9 and period 6. Iridium is a metal and it is classified as a transition element.
Click on above elements in the periodic table to see their information.
Facts about iridium
Here are a few interesting facts about the iridium element.
- Smithson Tennant was the chemist who discovered the iridium element in the year 1803.
- Iridium was given its name from the Latin word “Iris”, meaning rainbow.
- Iridium is the 2nd most dense element after osmium.
- Machining of iridium metal is very difficult as it is very hard.
- The concentration of iridium in the earth’s crust is only 0.4 parts per billion, which is very rare.
Properties of iridium
Here is a list of some physical properties and chemical properties of iridium.
Physical properties of iridium
- Iridium has a silvery white metallic appearance.
- Iridium has FCC crystal structure.
- Iridium has many isotopes, and the most abundant isotope is 193Ir.
- Iridium has a density of 22.56 g/cm3 and its atomic mass is 192.22 amu.
- The melting point and boiling point of iridium is 2719 K and 4403 K respectively.
Chemical properties of iridium
- Iridium is unreactive to most of the acids.
- Iridium reacts with the atmospheric oxygen at higher temperatures.
- Iridium reacts with sulfur to give iridium disulfide.
- Iridium reacts with salts like NaCl and NaCN.
Uses of iridium
Here are some uses of the iridium element.
- Iridium is mostly used as an alloying element with other metals to make them hard.
- Iridium is also used in crucible furnaces because it can resist high temperatures..
- Iridium is also used in making electrical contacts as well as fountain pen tips.
- The platinum-iridium alloy was used to make the international standard kilogram weight. (it contains 10% iridium and 90% platinum).
- Iridium is also used in crucible furnaces because it can resist high temperatures.
- Iridium – Wikipedia. (2023, January 1). Iridium – Wikipedia. https://en.wikipedia.org/wiki/Iridium
- Iridium – Element information, properties and uses | Periodic Table. (n.d.). Iridium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/77/iridium
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- Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/77.shtml
- Atomic Weight of Iridium | Commission on Isotopic Abundances and Atomic Weights. (n.d.). Atomic Weight of Iridium | Commission on Isotopic Abundances and Atomic Weights. https://ciaaw.org/iridium.htm
- Atomic Data for Iridium (Ir). (n.d.). Atomic Data for Iridium (Ir). https://physics.nist.gov/PhysRefData/Handbook/Tables/iridiumtable1.htm
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- C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – IRIDIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – IRIDIUM. https://pubsapp.acs.org/cen/80th/iridium.html?
- Possolo, et al. (2018, January 4). Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report). Pure and Applied Chemistry, 90(2), 395–424. https://doi.org/10.1515/pac-2016-0402
- Emsley, J. (2011). Nature’s Building Blocks: An A-Z Guide to the Elements. United Kingdom: OUP Oxford.
- Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics. https://doi.org/10.1201/b17118
- Electronic structure of the elements. (2000, March). The European Physical Journal C, 15(1–4), 78–79. https://doi.org/10.1007/bf02683401
- James A. M. & Lord M. P. (1992). Macmillan’s chemical and physical data. Macmillan.
- Bedford, et al. (1996, April 1). Recommended values of temperature on the International Temperature Scale of 1990 for a selected set of secondary reference points. Metrologia, 33(2), 133–154. https://doi.org/10.1088/0026-1394/33/2/3
- Allred, A. (1961, June). Electronegativity values from thermochemical data. Journal of Inorganic and Nuclear Chemistry, 17(3–4), 215–221. https://doi.org/10.1016/0022-1902(61)80142-5
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