Pu
Plutonium · element 94
Actinide · Solid at room temperature
Plutonium 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.
Key facts
Atomic mass
244 u
how heavy one atom is
Phase (room temp.)
Solid
Density
19.816 g/cm³
how tightly packed it is
Melting point
912.5 K (639 °C)
when solid turns to liquid
Boiling point
3505 K (3232 °C)
when liquid turns to gas
Period
7
its row in the periodic table
Group
3
its column in the periodic table
Block
F-block
the neighbourhood it lives in
Electronegativity
1.28
how strongly it pulls electrons
Electron configuration
[Rn] 5f6 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 24 · 8 · 2
electrons in each layer, inside to out
Discovered by
Glenn T. Seaborg
who found it
Appearance
silvery white, tarnishing to dark gray in air
what it looks like
Source: Wikipedia