Name mercury
Symbol Hg
Atomic Weight 200.59
Atomic Number 80
CAS ID 7439-97-6
Group Number 12
Group Name (none)
Period Number 6
Origin of Name Planet Mercury; Latin, hydragyrum = 'liquid silver."
Year Discovered Prehistoric.
Discovery Credits Known to ancient civilizations.
Class Metallic
Color Silvery White
Standard State Liquid at 77 F & 298 K
Description Liquid silvery metal. Stable in air and water, un-reactive to acids (except conc nitric) and alkalis. Used in chlorine and NaOH manufacture, street lights, fungicides, electrical apparatus, etc.

Diagnostic tests:
In a closed tube, a sublimate of metallic mercury or black HgS is yielded when the mineral is heated with dry soda (Na2CO3).
In solution, mercury (Hg1+), along with lead and silver form white, insoluble chlorides from aqueous solutions.

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