platinum

Name platinum
Symbol Pt
Atomic Weight 195.078
Atomic Number 78
CAS ID 7440-06-4
Group Number 10
Group Name Precious Metal
Period Number 6
Origin of Name Spanish, platina = "silver."
Year Discovered 1750
Discovery Credits Known to pre-Columbian South Americans and taken to Europe about 1790.
Class Metallic
Color Grayish White
Standard State Solid at 77 F & 298 K
Description Silvery-white metal, lustrous, malleable, ductile. Unaffected by oxygen and water, only dissolves in aqua-regia and fused alkalis. Used in jewelry, drugs, catalysts, etc.

Diagnostic tests: 
There are no simple chemical tests for platinum. The element is usually found as an alloy or a sulfide mineral with other platinum group metals. Atomic Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative analysis.

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