Search results
Results From The WOW.Com Content Network
Precious metals, particularly the noble metals, are more corrosion resistant and less chemically reactive than most elements. They are usually ductile and have a high lustre. Historically, precious metals were important as currency but they are now regarded mainly as investment and industrial raw materials.
The metals of antiquity are the seven metals which humans had identified and found use for in prehistoric times in Africa, Europe and throughout Asia: [1] gold, silver, copper, tin, lead, iron, and mercury. Zinc, arsenic, and antimony were also known during antiquity, but they were not recognised as distinct metals until later.
Noble metals tend to be resistant to oxidation and other forms of corrosion, and this corrosion resistance is often considered to be a defining characteristic. Some exceptions are described below. Copper is dissolved by nitric acid and aqueous potassium cyanide .
Trellium is a silvery red god metal with dark red spots similar to rust. It is the solid form of the Shard Autonomy's power. It is around a 9 on the Mohs Hardness Scale and repels Investiture. Unlike most other god metals in the Cosmere it is not commonly known by name of the vessel of the Shard from which it originates which would make it ...
A Sumerian paradise is usually associated with the Dilmun civilization of Eastern Arabia. Sir Henry Rawlinson first suggested the geographical location of Dilmun was in Bahrain in 1880. [2] This theory was later promoted by Friedrich Delitzsch in his book Wo lag das Paradies in 1881, suggesting that it was at the head of the Persian Gulf. [3]
Rhodium is a hard, silvery, durable metal that has a high reflectance. Rhodium metal does not normally form an oxide, even when heated. [25] Oxygen is absorbed from the atmosphere only at the melting point of rhodium, but is released on solidification. [26] Rhodium has both a higher melting point and lower density than platinum.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
In metallurgy, non-ferrous metals are metals or alloys that do not contain iron (allotropes of iron, ferrite, and so on) in appreciable amounts.. Generally more costly than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g. aluminium), higher conductivity (e.g. copper), [1] non-magnetic properties or resistance to corrosion (e.g. zinc). [2]