Tb
Terbium · element 65
Lanthanide · Solid at room temperature
Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
Key facts
Atomic mass
158.925352 u
how heavy one atom is
Phase (room temp.)
Solid
Density
8.23 g/cm³
how tightly packed it is
Melting point
1629 K (1356 °C)
when solid turns to liquid
Boiling point
3396 K (3123 °C)
when liquid turns to gas
Period
6
its row in the periodic table
Group
3
its column in the periodic table
Block
F-block
the neighbourhood it lives in
Electronegativity
1.1
how strongly it pulls electrons
Electron configuration
[Xe] 4f9 6s2
where its electrons live
Shells
2 · 8 · 18 · 27 · 8 · 2
electrons in each layer, inside to out
Discovered by
Carl Gustaf Mosander
who found it
Appearance
silvery white
what it looks like
Source: Wikipedia