palladium

Name palladium
Symbol Pd
Atomic Weight 106.42
Atomic Number 46
CAS ID 7440-05-3
Group Number 10
Group Name Precious Metal
Period Number 5
Origin of Name After the asteroid "Pallas"
Year Discovered 1803
Discovery Credits Discovered by W. H. Wellaston at London, UK.
Class Metallic
Color Silvery White Metallic
Standard State Solid at 77 F & 298 K
Description Silvery-white metal, lustrous, malleable, ductile. Resists corrosion, dissolves in oxidizing acids and fused alkalis. Readily absorbs hydrogen gas. Main use is as a catalyst.

Diagnostic tests: 
There are no simple chemical tests for palladium. 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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