Element 45 of Periodic table is Rhodium with atomic number 45, atomic weight 102.9055. Rhodium, symbol Rh, has a Face Centered Cubic structure and Silver color. Rhodium is a transition metal element. Know everything about Rhodium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.
Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group.
Read key information and facts about element Rhodium
Name | Rhodium |
Atomic Number | 45 |
Atomic Symbol | Rh |
Atomic Weight | 102.9055 |
Phase | Solid |
Color | Silver |
Classification | transition metal |
Group in Periodic Table | 9 |
Group Name | cobalt family |
Period in Periodic Table | 5 |
Block in Periodic Table | d-block |
Electronic Configuration | [Kr] 4d8 5s1 |
Melting Point | 1964 °C |
Boiling Point | 3695 °C |
Electronic Shell Structure | [2, 8, 18, 16, 1] |
CAS Number | CAS7440-16-6 |
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 45 to find Rhodium on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Rhodium on periodic table look for cross section of group 9 and period 5 in the modern periodic table.
The element Rhodium was discovered by William Hyde Wollaston in year 1803 in United Kingdom . Rhodium derived its name from the Greek rhodos, meaning 'rose coloured'
The table below shows the abundance of Rhodium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.
Ppb by weight (1ppb =10^-7 %) | |
---|---|
Abundance in Universe | 6×10-8% |
Abundance in Sun | 2×10-7% |
Abundance in Meteorites | 1.8e-07 |
Abundance in Earth's Crust | 7×10-8% |
Abundance in Oceans | N/A |
Abundance in Humans | N/A |
The solid state structure of Rhodium is Face Centered Cubic.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
a | b | c |
---|---|---|
380.34 | 380.34 | 380.34 pm |
and the angles between them Lattice Angles (alpha, beta and gamma).
alpha | beta | gamma |
---|---|---|
π/2 | π/2 | π/2 |
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
Space Group Name | Fm_ 3m |
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Space Group Number | 225 | |
Crystal Structure | Face Centered Cubic |
Rhodium atoms have 45 electrons and the electronic shell structure is [2, 8, 18, 16, 1] with Atomic Term Symbol (Quantum Numbers) 4F9/2.
Atomic Number | 45 |
Number of Electrons (with no charge) | 45 |
Number of Protons | 45 |
Mass Number | 103 |
Number of Neutrons | 58 |
Shell structure (Electrons per energy level) | [2, 8, 18, 16, 1] |
Electron Configuration | [Kr] 4d8 5s1 |
Valence Electrons | 4d8 5s1 |
Oxidation State |
-3;-1
1;2;3;4;5;6 |
Atomic Term Symbol (Quantum Numbers) | 4F9/2 |
Shell Structure of Rhodium - Electrons per energy level
n | s | p | d | f | |
---|---|---|---|---|---|
1 | K | 2 | |||
2 | L | 2 | 6 | ||
3 | M | 2 | 6 | 10 | |
4 | N | 2 | 6 | 8 | |
5 | O | 1 |
The ground state electronic configuration of Neutral Rhodium atom is [Kr] 4d8 5s1. The portion of Rhodium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Kr]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 4d8 5s1, electrons in the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Rhodium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d8 5s1
Rhodium atomic radius is 173 pm, while it's covalent radius is 135 pm.
Atomic Radius |
173 pm (1.73 Å) |
Atomic Volume | 8.26550200803 cm3 |
Covalent Radius | 135 pm (1.35 Å) |
Van der Waals Radius | N/A |
Neutron Cross Section | 145 σa/barns |
The electron affinity of Rhodium is 109.7 kJ/mol
Valence | 6 |
Electronegativity | 2.28 |
ElectronAffinity | 109.7 kJ/mol |
Refer to table below for Ionization energies of Rhodium
Ionization energy number | Enthalpy - kJ/mol |
---|---|
1 | 719.7 |
2 | 1740 |
3 | 2997 |
Refer to below table for Rhodium Physical Properties
Density | 12.45 g/cm3 |
Molar Volume | 8.26550200803 cm3 |
Young Modulus | 275 GPa |
Shear Modulus | 150 GPa |
Bulk Modulus | 380 GPa |
Poisson Ratio | 0.26 |
Mohs Hardness | 6 MPa |
Vickers Hardness | 1246 MPa |
Brinell Hardness | 1.1×103 MPa |
Rhodium is Conductor of electricity. Refer to table below for the Electrical properties of Rhodium
Electrical Conductivity | 2.3×107 S/m |
Resistivity | 4.3×10-8 m Ω |
Superconducting Point | N/A |
Thermal Conductivity | 150 W/(m K) |
Thermal Expansion | 8.2×10-6 K-1 |
Magnetic Type | Paramagnetic |
Curie Point | N/A |
Mass Magnetic Susceptibility | 1.36×10-8 |
Molar Magnetic Susceptibility | 1.4×10-9 |
Volume Magnetic Susceptibility | 0.0001693 |
Refractive Index | N/A |
Speed of Sound | 4.7×103 m/s |
Refer to table below for Thermal properties of Rhodium
Melting Point | 2237 K (1964 °C) |
Boiling Point | 3968 K (3695 °C) |
Critical Temperature | N/A |
Superconducting Point | N/A |
Heat of Fusion | 21.7 kJ/mol |
Heat of Vaporization | 495 kJ/mol |
Heat of Combustion | N/A |
Isotopes of rhodium. Naturally occurring Rhodium has 1 stable isotope - 103Rh.
Isotope | Isotope Mass | % Abundance | T half | Decay Mode |
---|---|---|---|---|
89Rh | ||||
90Rh | ||||
91Rh | ||||
92Rh | ||||
93Rh | ||||
94Rh | ||||
95Rh | ||||
96Rh | ||||
97Rh | ||||
98Rh | ||||
99Rh | ||||
100Rh | ||||
101Rh | ||||
102Rh | ||||
103Rh | 100% | Stable | N/A | |
104Rh | ||||
105Rh | ||||
106Rh | ||||
107Rh | ||||
108Rh | ||||
109Rh | ||||
110Rh | ||||
111Rh | ||||
112Rh | ||||
113Rh | ||||
114Rh | ||||
115Rh | ||||
116Rh | ||||
117Rh | ||||
118Rh | ||||
119Rh | ||||
120Rh | ||||
121Rh | ||||
122Rh |
CAS Number | CAS7440-16-6 |
RTECS Number | RTECSVI9069000 |
DOT Hazard Class | 4.1 |
DOT Numbers | 3089 |
EU Number | N/A |
NFPA Fire Rating | N/A |
NFPA Hazards | N/A |
NFPA Health Rating | N/A |
NFPA Reactivity Rating | N/A |
Autoignition Point | N/A |
Flashpoint | N/A |
List of unique identifiers to search the element in various chemical registry databases
Database | Identifier number |
---|---|
CAS Number - Chemical Abstracts Service (CAS) | CAS7440-16-6 |
CID Number | CID23948 |
Gmelin Number | N/A |
NSC Number | N/A |
RTECS Number | RTECSVI9069000 |
Metalloid |
Nonmetals |
Other Nonmetals | |
Halogens | Noble Gas |
Metals |
|
Alkali Metals | Alkaline Earth Metals |
Transition Metals | Post-Transition Metals |
Lanthanide | Actinide |