Elements
77

Ir

Iridium

Iridium (Ir) is a heavy white metal that has the atomic number 77 in the periodic table. It is a Transition metal in Group 9. It has the symbol Ir.

Iridium was discovered in 1803 by Smithson Tennant in London when he used platinum ores and washed them with hydrochloric and nitric acid. Iridium is named after the Latin word ‘iris’ meaning colourful as its salts are highly coloured. It is hypothesised that the comet that struck the earth killing the dinosaurs was made of Iridium due to the rich Iridium layer located at the site of many impact sites. Iridium’s main use is in the hardening of platinum alloys and also making crucibles for heating due to its high melting point. It is a solid metal at room temperature with a melting point of 2466°c and a boiling point of 4130°c.

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FAQ's

What is the Melting Point for Iridium?

Iridium has a Melting Point of 2410°F, meaning at 2410°F it will turn to a liquid.

What is the Boiling Point for Iridium?

Iridium has a Boiling Point of 4130°F, meaning at 4130°F it will turn to a Gas.

What is the Electronegativity of Iridium?

Iridium's Electronegativty is 2.2. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Iridium?

Iridium has a Heat of Vaporization of 604 kJ/mol.

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.

Sources

Found in gravel deposits with platinum.

77
Protons
77
Electrons
115
Neutrons

Ir

Element Symbol
Ir
Atomic Weight
192.217
Atomic Number
77
State
Solid
Melting Point
Unknown
2410
°C
Boiling Point
4130
Unknown
°C
Heat of Vaporization
604
Unknown
kJ/mol
Crystal Structure
Cubic: Face centered
Thermoconductivity
1.47
Unknown
W/cmK
Shells
2,8,18,32,15,2
Group
Transition Metal
Period
6
Block
D Block
Orbitals
[Xe] 4f14 5d7 6s2
Coefficient of Thermal Expansion
6.4 10^-6 K^-1
Covalent Radius
1.27 Å
Density at 293K
22.42 g/cm³
Electrical Conductivity
0.197 10^6/cm ohm
First Ionization Potential
9.1 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
.63 (+4) Å
Oxydation States
2,3,(4),6
Lattice Parameter
3.8390 Å
Lattice Parameter 2
--
Lattice Parameter 3
a=70° 32'
Pronounced

i-RID-i-em

Discovered by

S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils

Discovery date

1804

Orbital configuration
2,8,18,32,15,2

Download the Periodic Table

Explore Other Transition Metals

196.967
79

Au

Gold
190.23
76

Os

Osmium
180.948
73

Ta

Tantalum
102.905
45

Rh

Rhodium
270
108

Hs

Hassium
91.224
40

Zr

Zirconium
47.867
22

Ti

Titanium
285
112

Cn

Copernicium
50.942
23

V

Vanadium
178.49
72

Hf

Hafnium
65.38
30

Zn

Zinc
63.546
29

Cu

Copper
58.933
27

Co

Cobalt
200.592
80

Hg

Mercury
44.956
21

Sc

Scandium
107.868
47

Ag

Silver
54.938
25

Mn

Manganese
51.996
24

Cr

Chromium
183.84
74

W

Tungsten
92.906
41

Nb

Niobium
95.95
42

Mo

Molybdenum
106.42
46

Pd

Palladium
186.207
75

Re

Rhenium
195.084
78

Pt

Platinum
267
104

Rf

Rutherfordium
269
106

Sg

Seaborgium
55.845
26

Fe

Iron
58.693
28

Ni

Nickel
270
107

Bh

Bohrium
112.414
48

Cd

Cadmium
97
43

Tc

Technetium
88.906
39

Y

Yttrium
270
105

Db

Dubnium
101.07
44

Ru

Ruthenium
Transition metal is any of various chemical elements that have valence electrons (electrons that can participate in the formation of chemical bond) in two shells instead of only one. They form group 3 (IIIb) through group 12 (IIb).
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