Ho
Holmium · element 67
Lanthanide · Solid at room temperature
Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve.
Key facts
Atomic mass
164.930332 u
how heavy one atom is
Phase (room temp.)
Solid
Density
8.79 g/cm³
how tightly packed it is
Melting point
1734 K (1461 °C)
when solid turns to liquid
Boiling point
2873 K (2600 °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
1.23
how strongly it pulls electrons
Electron configuration
[Xe] 4f11 6s2
where its electrons live
Shells
2 · 8 · 18 · 29 · 8 · 2
electrons in each layer, inside to out
Discovered by
Marc Delafontaine
who found it
Appearance
silvery white
what it looks like
Source: Wikipedia