Element 77 of Periodic table is
Iridium with atomic number 77,
atomic weight 192.217.
Iridium, symbol Ir, has a
Face Centered Cubic structure and Silver color.
Iridium is a transition metal element.
Know everything about Iridium Facts, Physical Properties, Chemical
Properties, Electronic configuration, Atomic and Crystal Structure.
Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium) based on measured density, although calculations involving the space lattices of the elements show that iridium is denser. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.
Read key information and facts about element Iridium
Explore our interactive periodic table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of
The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and
ends at bottom right (atomic number 118). Therefore you can directly look for atomic number
77 to find Iridium on periodic table.
Another way to read periodic table and locate an element is by using group number (column)
and period number (row). To locate Iridium on periodic
table look for cross section of group 9 and period
6 in the modern periodic table.
Interactive Periodic Table to Understand
and Learn Cool Trends
The element Iridium was discovered by Smithson Tennant in year
1803 in France and United Kingdom
derived its name from Iris, the Greek goddess of the rainbow
The table below shows the abundance of Iridium in Universe, Sun, Meteorites,
Earth's Crust, Oceans and Human Body.
The solid state structure of Iridium is Face Centered Cubic.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in
dimensional space to form the structure.
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell
Lattice Constants (a, b and c)
and the angles between them Lattice Angles (alpha, beta and gamma).
The positions of the atoms inside the unit cell are described by the set of atomic positions (
xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible
symmetric arrangements of particles in three-dimensional space are described by the 230 space groups
(219 distinct types, or 230 if chiral copies are considered distinct.
Iridium atoms have 77 electrons and
the electronic shell structure is [2, 8, 18, 32, 15, 2] with Atomic Term Symbol (Quantum Numbers) 4F9/2.
Shell Structure of Iridium - Electrons per energy
The ground state electronic configuration of Neutral Iridium atom is
[Xe] 4f14 5d7 6s2.
The portion of Iridium configuration that is equivalent to the noble gas of
the preceding period, is abbreviated as [Xe]. For atoms with many electrons, this
notation can become lengthy and so an abbreviated notation is used.This is important as it is
the Valence electrons 4f14 5d7 6s2, electrons in
the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Iridium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d7 6s2
Iridium atomic radius is 180 pm, while it's covalent radius is 137 pm.
The electron affinity of Iridium is 151 kJ/mol
Refer to table below for Ionization energies of Iridium
Refer to below table for Iridium Physical Properties
Iridium is Conductor of electricity. Refer to
below for the Electrical properties of Iridium
Refer to table below for Thermal properties of Iridium
Isotopes of rhodium. Naturally occurring Iridium has
2 stable isotope -
List of unique identifiers to search the element in various chemical registry databases