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Basic Information

Name: Lead
Symbol: Pb
Atomic Number: 82
Atomic Mass: 207.2 amu
Melting Point: 327.5 °C (600.65 K, 621.5 °F)
Boiling Point: 1740.0 °C (2013.15 K, 3164.0 °F)
Number of Protons/Electrons: 82
Number of Neutrons: 125
Classification: Other Metals
Crystal Structure: Cubic
Density @ 293 K: 11.34 g/cm³
Color: bluish

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Pb-202	53000.0 years
Pb-203	2.16 days
Pb-204	Stable
Pb-204m	1.12 hours
Pb-205	1.5E7 years
Pb-206	Stable
Pb-207	Stable
Pb-208	Stable
Pb-209	3.25 hours
Pb-210	22.3 years
Pb-211	36.1 minutes
Pb-212	10.64 hours
Pb-214	27.0 minutes

Facts

Date of Discovery: Known to the ancients
Discoverer: Unknown
Name Origin: From the Greek word protos (first)
Symbol Origin: From the Latin word plumbum (lead)
Uses: solder and shielding against radiation, batteries
Obtained From: galena

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