Iridium Element (Periodic Table)

Iridium

Iridium (Ir) is a chemical element of the periodic table, located in the group 9 and the period 6, and is having the atomic number 77. It is a hard, brittle, silvery-white transition metal, which is named after Iris, Greek goddess of the rainbow.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
– d block

FAQs on Iridium Element

Iridium
‣ What does iridium look like?

Appearance: silvery white
‣ Who discovered iridium? When was the element iridium discovered?

Discovery and first isolation: Smithson Tennant (1803)
‣ Where is iridium on the periodic table?

Iridium Periodic Table

Location: Iridium is found in the ninth column of the periodic table, next to the osmium element.
‣ What is the atomic number of iridium?

Atomic number (Z): 77
Iridium symbol: Ir
‣ What is the atomic weight of iridium?

Standard atomic weight: 192.217
‣ What block does iridium belong to?

Block: d-block
‣ What group does iridium belong to?

Group: 9
‣ What period is iridium on the periodic table?

Period: 6
Iridium atomic radius: empirical: 136 pm
Iridium covalent radius: 141±6 pm
‣ What is the melting point of iridium?

Melting point: 2719 K (2446 °C, 4435 °F)
‣ What is the boiling point of iridium?

Boiling point: 4403 K (4130 °C, 7466 °F)
‣ How many electron shells does iridium have?

Electrons per shell: 2, 8, 18, 32, 15, 2
‣ What is the abbreviated electron configuration for iridium?

Electron configuration: [Xe] 4f14 5d7 6s2
Iridium ionization energies:
1st: 880 kJ/mol
2nd: 1600 kJ/mol
‣ What is the phase of iridium?

Phase (at r.t): solid
‣ What is the density of iridium?

Density (near r.t): 22.56 g/cm3
when liquid (at m.p): 19 g/cm3
Iridium magnetic ordering: paramagnetic
Iridium natural occurrence: primordial
‣ What is the oxidation state of iridium?

Oxidation state: -3, -1, 0, +1, +2, +3, +4, +5, +6, +7, +8, +9
‣ What’s the electronegativity of iridium?

Electronegativity: Pauling scale: 2.20
Iridium poisson’s ratio: 0.26
Iridium heat of fusion: 41.12 kJ/mol
Iridium heat of vaporization: 564 kJ/mol
Iridium molar heat capacity: 25.10 J/(mol K)
Iridium molar magnetic susceptibility: +25.6 × 10-6 cm3/mol (298 K)
Speed of sound in iridium: 4825 m/s (at 20 °C)
Iridium crystal structure: face-centered cubic (fcc)
Thermal expansion of iridium: 6.4 µm/(m.K)
Thermal conductivity of iridium: 147 W/(m.K)
Iridium electrical resistivity: 47.1 nΩ.m (at 20 °C)
‣ Iridium hardness

Mohs hardness: 6.5
Vickers hardness: 1760-2200 MPa
Brinell hardness: 1670 MPa
Young’s modulus of iridium: 528 GPa
Shear modulus of iridium: 210 GPa
Bulk modulus of iridium: 320 GPa
Iridium CAS number: 7439-88-5

‣ Iridium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)271329573525361440694659

‣ How many isotopes does iridium have?

Main isotopes of iridium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
188Irsyn1.73 dε188Os
189Irsyn13.2 dε189Os
190Irsyn11.8 dε190Os
191Ir37.3 %stable
192Irsyn73.827 dβ
ε
192Pt
192Os
192Irsyn241 yIT192Ir
193Ir62.7 %stable
193Irsyn10.5 dIT193Ir
194Irsyn19.3 hβ194Pt
194Irsyn171 dIT194Ir

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