Tabla

Electronic ConfigurationXe 6s2 4f14 5d7

Melting Point2410°C

Boiling Point4130°C

Density22.42g cm⁻³

Description

Very hard and brittle, silvery metallic transition element. It has a yellowish cast to it. Salts of Iridium are highly colored. It is the most corrosion resistant metal known, not attacked by any acid, but is attacked by molten salts. There are two natural isotopes of Iridium, and 4 radioisotopes, the most stable being ¹⁹²Ir with a half-life of 73.83 days. ¹⁹²Ir decays into Platinum, while the other radioisotopes decay into Osmium. Iridium is used in high temperature apparatus, electrical contacts, and as a hardening agent for platinumpy. Discovered in 1803 by Smithson Tennant in England. The name comes from the Greek word iris, which means rainbow. Iridium metal is generally non-toxic due to its relative unreactivity, but Iridium compounds should be considered highly toxic.

Covalent Radius122pm

Double115pm

Triple107pm

Ionisation Energies

Oxidation States-1, 0, +1, +2, +3, +4, +6

Uses

Used with Osmium to tip Gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for Platinum.

Electron Affinity150.88kJ mol⁻¹

Electronegativity2.2PAULING

Atomic Volume8.54cm³ mol⁻¹

Atomic Radius136pm

Metallic Radius127pm

Van Der Waals Radius213pm

Sources

Found in gravel deposits with Platinum.

Discovery

Discovered in 1804 by S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils in England/France

Name Origin

Latin: iris (rainbow).

CAS7439-88-5

Crust Abundance0.001mg kg⁻¹

Enthalpy of Vapourisation 604kJ mol⁻¹

Enthalpy of Fusion27.61kJ mol⁻¹

Enthalpy of Formation669kJ mol⁻¹

Specific Heat - 20°C0.133J (g ⋅ K)⁻¹

Thermal Conductivity147W (m ⋅ K)⁻¹

Isotope	Abundance	Half Life
191Ir	37.3%	-
193Ir	62.7%	-

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

MIT License Copyright (c) 2020 reubn Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. pb2bb3a9eb2b62a1fdf94