Symbol	Pu
Atomic number	94
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	Silvery white, tarnishing to dark gray in air
Color	Silver

Number of protons	94 p+
Number of neutrons	150 n0
Number of electrons	94 e-

From Wikipedia, the free encyclopediaPlutonium is a transuranic radioactive chemical element with symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states.

Phase at STP	Solid
Density	19.816 g/cm3
Atomic weight	244 u

Melting point	912.5 K 639.35 °C 1182.83 °F
Boiling point	3505 K 3231.85 °C 5849.33 °F
Heat of vaporization	333.5 kJ/mol

Electronegativity (Pauling Scale)	1.28
Electron affinity	-48.33 kJ/mol
Oxidation states	+2, +3, +4, +5, +6, +7, +8 (an amphoteric oxide)
Ionization energies	584.7 kJ/mol 1128 kJ/mol 2084 kJ/mol 3338 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f6 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f6 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f6 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 24, 8, 2
Valence electrons	2
Valency electrons	3,4,5,6
Bohr model	Figure: Shell diagram of Plutonium (Pu) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Glenn T. Seaborg, Arthur Wahl, Joseph W. Kennedy, Edwin McMillan (1940)

CAS Number	7440-07-5
ChemSpider ID	22382
EC number	231-108-8
PubChem CID Number	23940