Rhodium

Metal

Symbol: Rh
Atomic number: 45
Atomic mass: 102.90550
Group: Transition Metal
CAS-number: 7440-16-6

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Electronic data

Shells: 2, 8, 18, 16, 1
Orbitals: [Kr] 4d⁸ 5s¹
Electronegativity: 2.2, 1.4
1. Ionization potential: 7.4589 eV
2. Ionization potential: 18.08 eV
3. Ionization potential: 31.06 eV
Oxidation states: 5, 4, 3, 1, 2, 0
Electrical conductivity: 0.211 10^6

Thermal data

Melting point: 1966 °C ±3
Boiling point: 3695 °C
Specific heat: 0.242 J/gK
Heat of fusion: 21.50 kJ/mol
Heat of vaporization: 493.0 kJ/mol
Thermal conductivity: 1.50 W/cmK

Steric data

Atomic radius: 1.83 Å
Ionic radius: 0.67 Å (+3)
Covalent radius: 1.25 Å
Atomic volume: 8.3 cm³/mol
Density (293 K): 12.4 g/cm³
Crystal structure: cubic face centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
¹⁰¹Rh	0	101	1/2	3.3y	EC	View
¹⁰¹Rhm	0	101	9/2	4.35d	EC, IT	View
¹⁰²Rh	0	102	6	~2.9y	EC	View
¹⁰²Rhm	0	102	2	207d	EC, β-, β+	View
¹⁰³Rh	100	102.906	1/2	--	--
¹⁰³Rhm	0	103	7/2	56.12m	IT	View
¹⁰⁵Rh	0	105	7/2	35.36h	β-	View
¹⁰⁵Rhm	0	105	1/2	40s	IT	View
¹⁰⁶Rh	0	106	1	29.9s	β-	View

Name origin:	Greek: rhodon (rose). Its salts give a rosy solution.
Description:	Hard, silvery-white metal
Discovered by:	William Wollaston
Year:	1803
Place:	England
Sources:	Obtained as a by-product of nickel production.
Use(s):	Used as a coating to prevent wear on high quality science equipment and with platinum to make thermocouples.

Rhodium

Physical data

Electronic data

Thermal data

Steric data

Isotopes

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