Discovered By: Ralph Arthur James, Leon O. Morgan, Glenn Seaborg, Albert Ghiorso
Discovery year: 1944

The following table showing some properties of Americium(Am):

Table Example
Atomic number 95
Group n/a
Period 7
Block f
Electrons 95
Protons 95
Neutrons 148
Atomic weight (243)
Oxidation states +3, +4, +5, +6
Ionic charge Am^3+, Am^4+


Table Example
Electrons per shell K2 L8 M18 N32 O28 P8 Q2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^6 7s^2 5f^7
Covalent radius 180 pm
Boiling point 2011°C
Melting point 1176°C
Phase Solid
Color Silver
Density 13670 kg.m^-3
Molar volume 1.78*10^-5 m^3.mol^-1
Magnetic type Paramagnetic


Table Example
Superconducting point 0.6 K
Electronegativity 1.3
Valence 4
First ionization energy 578 kJ.mol^-1
Radioactive Yes
Half life 2.33*10^11 s
Lifetime 3.36*10^11 s
Neutron cross section 74 barn
Decay mode Alpha emission (α-decay)