Elements
76

Os

Osmium

Osmium (Os) is a hard fine black powder or blue-white metal that has the atomic number 76 in the periodic table. It is a Transition metal in Group 8. It has the symbol Os.

Osmium is a very heavy metal due to its large atomic mass. It is known to produce an unpleasant smell and is highly toxic when in compounds. Its name is drawn from the Greek word Osme meaning smell. Whilst Osmium does not have many uses its oxide, Osmium Tetroxide is used to stain fatty acid tissues for microscopes and in fingerprint detection. It is also used in electrical equipment as an alloy. It is not a natural element in the earth’s crust instead existing in ores Iridomine usually found in the Americas of Ural mountains. It is a solid metal at room temperature with a melting point of 3327°c and a boiling point of 5300°c.

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FAQ's

What is the Melting Point for Osmium?

Osmium has a Melting Point of 3033°F, meaning at 3033°F it will turn to a liquid.

What is the Boiling Point for Osmium?

Osmium has a Boiling Point of 5012°F, meaning at 5012°F it will turn to a Gas.

What is the Electronegativity of Osmium?

Osmium'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 Osmium?

Osmium has a Heat of Vaporization of 746 kJ/mol.

Uses

Used to tip gold pen points, instrument pivots, to make electric light filaments. Used for high temp. alloys and pressure bearings. Very hard and resists corrosion better than any other.

Sources

Obtained from the same ores as platinum.

76
Protons
76
Electrons
114
Neutrons

Os

Element Symbol
Os
Atomic Weight
190.23
Atomic Number
76
State
Solid
Melting Point
Unknown
3033
°C
Boiling Point
5012
Unknown
°C
Heat of Vaporization
746
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
0.876
Unknown
W/cmK
Shells
2,8,18,32,14,2
Group
Transition Metal
Period
6
Block
D Block
Orbitals
[Xe] 4f14 5d6 6s2
Coefficient of Thermal Expansion
5.1 10^-6 K^-1
Covalent Radius
1.26 Å
Density at 293K
22.40 g/cm³
Electrical Conductivity
0.109 10^6/cm ohm
First Ionization Potential
8.7 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
.63 (+4) Å
Oxydation States
2,3,(4),6,8
Lattice Parameter
2.7354 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

OZ-mi-em

Discovered by

Smithson Tenant

Discovery date

1803

Orbital configuration
2,8,18,32,14,2

Download the Periodic Table

Explore Other Transition Metals

112.414
48

Cd

Cadmium
178.49
72

Hf

Hafnium
102.905
45

Rh

Rhodium
55.845
26

Fe

Iron
107.868
47

Ag

Silver
106.42
46

Pd

Palladium
192.217
77

Ir

Iridium
269
106

Sg

Seaborgium
95.95
42

Mo

Molybdenum
54.938
25

Mn

Manganese
65.38
30

Zn

Zinc
200.592
80

Hg

Mercury
63.546
29

Cu

Copper
51.996
24

Cr

Chromium
270
105

Db

Dubnium
50.942
23

V

Vanadium
183.84
74

W

Tungsten
101.07
44

Ru

Ruthenium
92.906
41

Nb

Niobium
270
108

Hs

Hassium
270
107

Bh

Bohrium
180.948
73

Ta

Tantalum
91.224
40

Zr

Zirconium
58.933
27

Co

Cobalt
195.084
78

Pt

Platinum
196.967
79

Au

Gold
97
43

Tc

Technetium
44.956
21

Sc

Scandium
186.207
75

Re

Rhenium
47.867
22

Ti

Titanium
88.906
39

Y

Yttrium
267
104

Rf

Rutherfordium
285
112

Cn

Copernicium
58.693
28

Ni

Nickel
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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