Lead Element Facts


Bright, untarnished lead balls.

Bright, untarnished lead balls.

82
Pb
207.2

Data Zone

Classification: Lead is an ‘other metal’
Color: bluish gray
Atomic weight: 207.2
State: solid
Melting point: 327.46 oC, 600.61 K
Boiling point: 1750 oC, 2023 K
Electrons: 82
Protons: 82
Neutrons in most abundant isotope: 126
Electron shells: 2,8,18,32,18,4
Electron configuration: [Xe] 4f14 5d10 6s2 6p2
Density @ 20oC: 11.34 g/cm3
Show more, including: Heats, Energies, Oxidation, Reactions, Compounds, Radii, Conductivities
Atomic volume: 18.17 cm3/mol
Structure: fcc: face-centered cubic
Hardness: 1.5 mohs
Specific heat capacity 0.13 J g-1 K-1
Heat of fusion 4.77 kJ mol-1
Heat of atomization 196 kJ mol-1
Heat of vaporization 177.9 kJ mol-1
1st ionization energy 715.6 kJ mol-1
2nd ionization energy 1450.5 kJ mol-1
3rd ionization energy 3081.5 kJ mol-1
Electron affinity 35.1 kJ mol-1
Minimum oxidation number -4
Min. common oxidation no. 0
Maximum oxidation number 4
Max. common oxidation no. 4
Electronegativity (Pauling Scale) 2.33
Polarizability volume 6.8 Å3
Reaction with air mild, w/ht ⇒ PbO
Reaction with 15 M HNO3 mild, ⇒ NOx, Pb(NO3)2
Reaction with 6 M HCl none
Reaction with 6 M NaOH
Oxide(s) PbO (litharge), PbO2, Pb2O3, Pb3O4
Hydride(s) PbH4
Chloride(s) PbCl2 & PbCl4
Atomic radius 180 pm
Ionic radius (1+ ion)
Ionic radius (2+ ion) 133 pm
Ionic radius (3+ ion)
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity 35.3 W m-1 K-1
Electrical conductivity 4.8 x 106 S m-1
Freezing/Melting point: 327.46 oC, 600.61 K



Discovery of Lead

Lead has been known since ancient times. We do not know who discovered it.

Its ores are widely distributed and it has a low melting point so it is easily smelted.

It was used in antiquity to make statues, coins, utensils and writing tablets. The Romans also used lead for plumbing.

The Romans called lead ‘plumbum nigrum’ meaning black lead to differentiate it from ‘plumbum album’ meaning white lead. We now call ‘white lead’ tin. Tin sits directly above lead in the periodic table.

Lead’s chemical symbol is Pb, which comes from its Latin name. Our name for the element comes from the Anglo-Saxon word for the metal, ‘lead’.

Uses of lead in the modern world.

The properties of lead explained.

A cargo tag made of lead was unearthed during excavation of the original colony at Jamestown, Virginia. It is believed to have made the trip from England in 1611.

Nasa: A cargo tag made of lead was unearthed during excavation of the original colony at Jamestown, Virginia. It is believed to have made the trip from England in 1611.

Appearance and Characteristics

Harmful effects:

Lead and its compounds are poisonous.

Characteristics:

Lead is a bluish-gray, soft, dense metal that has a bright luster when freshly cut.

It tarnishes slowly in moist air to form a dull gray coating.

The metal is highly ductile and malleable.

Lead is extremely resistant to corrosion and is a poor conductor of electricity.

Uses of Lead

Large quantities of lead, both as the metal and as the dioxide, are used in storage batteries.

Lead is also used in cable covering, as ammunition, as electrodes, in solder and as roofing material.

The metal is used as shielding from radiation, e.g. in x-ray rooms and nuclear reactors.

Lead oxide is also used in the manufacture of fine crystal glass.

Historically, lead was used in plumbing.

Tetraethyl lead was used as an anti-knock agent in petrol, and as an additive in paints. These uses have been reduced recently because of environmental concerns about cumulative lead poisoning.

Abundance and Isotopes

Abundance earth’s crust: 14 parts per million by weight, 1 part per million by moles

Abundance solar system: 10 parts per billion by weight, 70 parts per trillion by moles

Cost, pure: $2.45 per 100g

Cost, bulk: $0.02 per 100g

Source: Lead rarely occurs naturally in nature and is can be found in ores, mainly with copper, zinc and silver. The principal lead mineral is lead sulfide (galena, PbS). Other common minerals are cerussite (lead carbonate, PbCO3) and anglesite (lead sulfate, PbSO4). Lead is refined from galena (PbS) by heating. A large amount of lead is also recovered from recycling.

Isotopes: Lead has 35 isotopes whose half-lives are known, mass numbers 181 to 215. Naturally occurring lead is a mixture of four isotopes and they are found in the percentages shown: 204Pb (1.4%), 206Pb (24.1%), 207Pb (22.1%) and 208Pb (52.3%).

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Comments

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