Element Mercury

Mercury ElementIt is an element with atomic symbol Hg, atomic number 80, and atomic weight 200.59; a heavy, silvery-white metal, liquid at room temperature, a rather poor conductor of heat and a fair conductor of electricity.
It is commonly known as quicksilver and was formerly named hydrargyrum.
Mercury is a nonessential trace metal that is a well known toxin, second only to lead as a cause of heavy metal poisoning.
Element Mercury is used in many areas of manufacturing and is present in dental and medical equipment. Because of the toxicity of acute and chronic exposure to metallic mercury, this metal is now used less and less in industry and attempts are made to remove it from household and medical equipment and appliances.

Names and Identifiers

Chemical Formula:Hg
CAS:7439-97-6
Molecular Weight:200.59000 g/mol
EC Number :231-106-7
MDL Number:MFCD00011035
Color:silvery white/ silvery-white
Other Names:Mercure, Quecksilber, Mercurio
PubChem CID:23931
IUPAC Name:Mercury
Inchl:InChI=1S/Hg
InChI Key:QSHDDOUJBYECFT-UHFFFAOYSA-N
Canonical SMILES:[Hg]
ICSC Number:0056

Physical & Chemical Properties

Phase:liquid
Density:13.534 g/cm³
Boiling Point:629.88 K ​(356.73 °C, ​674.11 °F)
Melting Point:234.3210 K ​(−38.8290 °C, ​−37.8922 °F)
Molecular Formula:Hg
Flash Point:n/a
Exact Mass:201.97100
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H330-H360D-H372-H410
Precautionary Statements:n/a
Hazard Codes:T+,N
Risk Phrases:61-26-48/23-50/53
Safety Phrases:53-45-60-61
RIDADR:UN 2809 8/PG 3
WGK Germany:3
RTECS:OV4550000
Packaging Group:n/a
Hazard Class:n/a

There are seven stable isotopes of mercury, with 202Hg being the most abundant (29.86%). The longest-lived radioisotopes are 194Hg with a half-life of 444 years, and 203Hg with a half-life of 46.612 days. Most of the remaining radioisotopes have half-lives that are less than a day. 199Hg and 201Hg are the most often studied NMR-active nuclei, having spins of 1⁄2 and 3⁄2 respectively

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
196Hg195.965807 (5)0.15 (1)0
198Hg197.966743 (4)9.97 (20)0
199Hg198.968254 (4)16.87 (22)1/20.5058852
200Hg199.968300 (4)23.10 (19)0
201Hg200.970277 (4)13.18 (9)3/2-0.560225
202Hg201.970617 (4)29.86 (26)0
204Hg203.973467 (5)6.87 (15)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
194Hg193.96538520 yEC to 194Au0
195Hg194.966649.5 hEC to 195Au1/20.541475
197Hg196.9671952.672 dEC to 197Au1/20.527374
203Hg202.97285746.61 dβ to 203Tl5/20.8489

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