Discovered By: Arthur C. Wahl, Glenn Seaborg, Joseph William Kennedy
Discovery year: 1940

The following table showing some properties of Plutonium(Pu):

Table Example
Atomic number 94
Group n/a
Period 7
Block f
Electrons 94
Protons 94
Neutrons 150
Atomic weight (244)
Oxidation states +3, +4, +5, +6
Ionic charge Pu^4+, Pu^6+


Table Example
Electrons per shell K2 L8 M18 N32 024 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 7s62 5f^6
Covalent radius 187 pm
Boiling point 3230°C
Melting point 640°C
Phase Solid
Vaporization heat 325 kj>mol^-1
Color Silver
Density 19816 kg.m^-3
Liquid density 16630 kg.m^-3


Table Example
Poisson ratio 0.21
Shear modulus 43 GPa
Sound speed 2260 m.s^-1
Young's modulus 96 GPa
Electrical type Conductor
Magnetic type Paramagnetic
Resistivity 1.5*10^-6 Ohm.m
Electronegativity 1.28
Valence 6
First ionization energy 584.7 kJ.mol^-1


Table Example
Radioactive Yes
Half life 2.5*10^15 s
Lifetime 3.6*10^15 s
Neutron cross section 1.7 barn
Decay mode Alpha emission (α-decay)