Make your own free website on


Information valid for Am-243 unless otherwise noted

Basic Information

Symbol: Am
Atomic Number: 95
Mass: (243.0)
Melting Point: 994.0 C
Boiling Point: 2607.0 C
Number of Protons/Electrons: 95
Number of Neutrons: 148
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 13.6 g/cm3
Color: Unknown

Atomic Structure

[Bohr Model of Americium]
Number of Energy Levels: 7

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 25
    Sixth Energy Level: 8
    Seventh Energy Level: 2


Isotope Half Life
Am-240 2.1 days
Am-241 432.7 years
Am-242 16.0 hours
Am-242m 141.0 years
Am-243 7370.0 years
Am-244 10.1 hours
Am-245 2.1 hours
Am-246 39.0 minutes


Date of Discovery: 1945
Discoverer: G.T. Seaborg
Name Origin: After America
Uses: Smoke Detectors
Obtained From: Man-made