Elements
45

Rh

Rhodium

Rhodium (Rh) is a brittle silver-white metal that has the atomic number 45 in the periodic table. It is a Transition metal and located in Group 9 of the periodic table. It has the symbol Rh.

Rhodium was discovered in London in 1803 by William Wollaston after examining platinum ores that were bought back from Peru. He dissolved these ores in hydrochloric acid, nitric acids and ammonium chloride. It produced a deep red powder which when treated with Zinc precipitated pure Rhodium. Rhodium is highly reflective and resistant to corrosion, its major use is as a catalyst especially in the catalytic convertors of cars. Rhodium is found abundantly in ores in small quantities. It is located in Group 9 as a Transition metal. It has a melting point of 1963°c and a boiling point of 3695°c.

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FAQ's

What is the Melting Point for Rhodium?

Rhodium has a Melting Point of 1966°F, meaning at 1966°F it will turn to a liquid.

What is the Boiling Point for Rhodium?

Rhodium has a Boiling Point of 3695°F, meaning at 3695°F it will turn to a Gas.

What is the Electronegativity of Rhodium?

Rhodium's Electronegativty is 2.28. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Rhodium?

Rhodium has a Heat of Vaporization of 493 kJ/mol.

Uses

Used as a coating to prevent wear on high quality science equipment and with platinum to make thermocouples.

Sources

Obtained as a by-product of nickel production.

45
Protons
45
Electrons
58
Neutrons

Rh

Element Symbol
Rh
Atomic Weight
102.905
Atomic Number
45
State
Solid
Melting Point
Unknown
1966
°C
Boiling Point
3695
Unknown
°C
Heat of Vaporization
493
Unknown
kJ/mol
Crystal Structure
Cubic: Face centered
Thermoconductivity
1.5
Unknown
W/cmK
Shells
2,8,18,16,1
Group
Transition Metal
Period
5
Block
D Block
Orbitals
[Kr] 4d8 5s1
Coefficient of Thermal Expansion
8.2 10^-6 K^-1
Covalent Radius
1.25 Å
Density at 293K
12.4 g/cm³
Electrical Conductivity
0.211 10^6/cm ohm
First Ionization Potential
7.4589 V
Second Ionization Potential
18.08 V
Third Ionization Potential
31.06 V
Ionic Radius
.67 (+3) Å
Oxydation States
2,(3),4
Lattice Parameter
3.8045 Å
Lattice Parameter 2
--
Lattice Parameter 3
5.6169 Å
Pronounced

RO-di-em

Discovered by

William Wollaston

Discovery date

1803

Orbital configuration
2,8,18,16,1

Download the Periodic Table

Explore Other Transition Metals

106.42
46

Pd

Palladium
269
106

Sg

Seaborgium
47.867
22

Ti

Titanium
190.23
76

Os

Osmium
186.207
75

Re

Rhenium
270
105

Db

Dubnium
63.546
29

Cu

Copper
95.95
42

Mo

Molybdenum
58.693
28

Ni

Nickel
270
108

Hs

Hassium
91.224
40

Zr

Zirconium
267
104

Rf

Rutherfordium
92.906
41

Nb

Niobium
101.07
44

Ru

Ruthenium
270
107

Bh

Bohrium
112.414
48

Cd

Cadmium
183.84
74

W

Tungsten
51.996
24

Cr

Chromium
55.845
26

Fe

Iron
178.49
72

Hf

Hafnium
44.956
21

Sc

Scandium
88.906
39

Y

Yttrium
107.868
47

Ag

Silver
195.084
78

Pt

Platinum
97
43

Tc

Technetium
180.948
73

Ta

Tantalum
196.967
79

Au

Gold
65.38
30

Zn

Zinc
50.942
23

V

Vanadium
192.217
77

Ir

Iridium
200.592
80

Hg

Mercury
285
112

Cn

Copernicium
58.933
27

Co

Cobalt
54.938
25

Mn

Manganese
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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