Osmium Element (Periodic Table)

Osmium

Osmium (Os) is a chemical element of the periodic table, located in the group 8 and the period 6, and is having the atomic number 76. It is a hard, rare, brittle, lustrous, bluish-white transition metal, whose name comes from the Greek word “osme”, which means smell.

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 Osmium Element

Osmium
‣ What does osmium look like?

Appearance: silvery, blue cast
‣ Who discovered osmium? When was osmium discovered?

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

Osmium Periodic Table

Location: Osmium is found in the eighth column of the periodic table, next to the rhenium element.
‣ What is the atomic number of osmium?

Atomic number (Z): 76
‣ What is the symbol of osmium?

Symbol: Os
‣ What is the atomic weight of osmium?

Standard atomic weight: 190.23
‣ What block does osmium belong to?

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

Group: 8
‣ What period is osmium on the periodic table?

Period: 6
Osmium atomic radius: empirical: 135 pm
Osmium covalent radius: 144±4 pm
‣ What is osmium’s melting point?

Melting point: 3306 K (3033 °C, 5491 °F)
‣ What is the boiling point of osmium?

Boiling point: 5285 K (5012 °C, 9054 °F)
‣ How many electron shells does osmium have?

Electrons per shell: 2, 8, 18, 32, 14, 2
‣ What is the electron configuration of osmium?

Electron configuration: [Xe] 4f14 5d6 6s2
‣ What is the ionization energy of osmium?

Ionization energies:
1st: 840 kJ/mol
2nd: 1600 kJ/mol
‣ What is the phase of osmium?

Phase (at r.t): solid
‣ What is osmium’s density?

Density (near r.t): 22.59 g/cm3
when liquid (at m.p): 20 g/cm3
Osmium magnetic ordering: paramagnetic
Osmium natural occurrence: primordial
Osmium oxidation state: 0, +1, +2, +3, +4, +5, +6, +7, +8
‣ What is osmium electronegativity?

Electronegativity: Pauling scale: 2.2
Osmium poisson’s ratio: 0.25
Osmium heat of fusion: 31 kJ/mol
Osmium heat of vaporization: 378 kJ/mol
Osmium molar heat capacity: 24.7 J/(mol K)
Osmium molar magnetic susceptibility: 11 × 10-6 cm3/mol
Speed of sound in osmium: 4940 m/s (at 20 °C)
Osmium crystal structure: hexagonal close-packed (hcp)
Thermal expansion of osmium: 5.1 µm/(m.K) (at 25 °C)
Thermal conductivity of osmium: 87.6 W/(m.K)
Osmium electrical resistivity: 81.2 nΩ.m (at 20 °C)
‣ Osmium hardness

Mohs hardness: 7.0
Vickers hardness: 300 MPa
Brinell hardness: 293 MPa
Shear modulus of osmium: 222 GPa
Bulk modulus of osmium: 462 GPa
Osmium CAS number: 7440-04-2

‣ Osmium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)316034233751414846385256

‣ How many isotopes does osmium have?

Main isotopes of osmium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
184Os0.0 %stable
185Ossyn93.6 dε185Re
186Os1.59 %2.0 × 1015 yα182W
187Os1.96 %stable
188Os13.24 %stable
189Os16.15 %stable
190Os26.26 %stable
191Ossyn15.4 dβ191Ir
192Os40.78 %
193Ossyn30.11 dstable193Ir
194Ossyn6 yβ194Ir

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