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The Element Rhodium

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Definition of the Rhodium Element
A hard, durable, silvery-white metallic element that is used to form high-temperature alloys with Platinum and is plated on other metals to produce a durable corrosion-resistant coating. Rhodium has a high reflectance and has a higher melting point and lower density than platinum.  Rhodium together with ruthenium, palladium, Osmium, iridium, and platinum form a group of elements referred to as the platinum group metals (PGM). The Atomic Number of this element is 45 and the Element Symbol is Rh.

The Properties of the Rhodium Element
Symbol of Element : Rh
Atomic Number : 45
Atomic Mass: 102.9055 amu
Melting Point: 1966.0 C - 2239.15 K
Boiling Point: 3727.0 C - 4000.15 K
Number of Protons/Electrons: 45
Number of Neutrons: 58
Crystal Structure: Cubic
Density @ 293 K: 12.41 g/cm3
Color : silvery-white

Origin / Meaning of the name Rhodium
The name originates from the Greek word rhodon meaning rose because of the "rose color of dilute solutions of its salts".

Periodic Table Group and Classification of the of the Rhodium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Rhodium is classified as a "Transition Metal" which are located in Groups 3 - 12 of the Periodic Table. Elements classified as Transition Metals are generally described as ductile, malleable, and able to conduct electricity and heat. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

Facts about the History and the Discovery of the Rhodium Element
Rhodium was discovered by William Hyde Wollaston in England, 1803

History of the Periodic Table
Check out the brief History of the Periodic Table which details dates and the names of famous scientists and chemists who contributed to the development of the Periodic Table.

Occurrence of the Rhodium Element
Obtained as a by-product of Nickel production

Abundances of the element in different environments
% in Universe 610-8%
% in Sun 210-7%
% in Meteorites 0.000018%
% in Earth's Crust 710-8%
% in Oceans N/A
% in Humans N/A

Associated Uses of Rhodium
Alloying agent for hardening platinum and palladium
Coatings / plating
Electrodes for aircraft spark plugs
Jewelry
Oil of rhodium

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