Element Lead

Lead ElementLead (/ˈlɛd/) is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82.
It is a heavy metal that is denser than most common materials.
Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is silvery with a hint of blue; it tarnishes to a dull gray color when exposed to air.
Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements.

Names and Identifiers

Chemical Formula:Pb
CAS:7439-92-1
Molecular Weight:207.20000 g/mol
EC Number :231-100-4
MDL Number:MFCD00134050
Color:bluish gray/ bluish white
Other Names:n/a
PubChem CID:5352425
IUPAC Name:Lead
Inchl:InChI=1S/Pb
InChI Key:WABPQHHGFIMREM-UHFFFAOYSA-N
Canonical SMILES:[Pb]
ICSC Number:0052

Physical & Chemical Properties

Phase:Solid
Density:11.34 g/cm³
Boiling Point:2022 K ​(1749 °C, ​3180 °F)
Melting Point:600.61 K ​(327.46 °C, ​621.43 °F)
Molecular Formula:Pb
Flash Point:n/a
Exact Mass:207.97700
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H302 + H332-H351-H360Df-H373-H410
Precautionary Statements:P201-P261-P273-P304 + P340 + P312-P308 + P313-P391
Hazard Codes:T:Toxic
Risk Phrases:R20/22;R33;R50/53;R61;R62
Safety Phrases:S53-S45-S61-S36/37-S36-S26
RIDADR:UN 3082 9/PG 3
WGK Germany:3
RTECS:OF7525000
Packaging Group:III
Hazard Class:8

Natural lead consists of four stable isotopes with mass numbers of 204, 206, 207, and 208, and traces of five short-lived radioisotopes

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
204Pb203.973020 (5)1.4 (1)0
206Pb205.974440 (4)24.1 (1)0
207Pb206.975872 (4)22.1 (1)1/20.58219
208Pb207.976627 (4)52.4 (1)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
200Pb199.9718221.5 hEC to 200Tl0
201Pb200.972859.33 hEC to 201Tl5/20.675
202Pb201.9721453000 yEC to 202Tl; α to 198Hg0
203Pb202.973382.1615 dEC to 203Tl5/20.686
205Pb204.974471.51 x 107 yEC to 205Tl5/20.712
210Pb209.9841722.6 yβ to 210Bi; α to 206Hg0
211Pb210.9887336.1 mβ to 211Bi9/2-1.414
212Pb211.9918710.64 hβ to 212Bi0

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