Fm
Fermium · element 100
Actinide · Solid at room temperature
Fermium is a synthetic element with symbol Fm and atomic number 100. It is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.
Key facts
Atomic mass
257 u
how heavy one atom is
Phase (room temp.)
Solid
Melting point
1800 K (1527 °C)
when solid turns to liquid
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
1.3
how strongly it pulls electrons
Electron configuration
[Rn] 5f12 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 30 · 8 · 2
electrons in each layer, inside to out
Discovered by
Lawrence Berkeley National Laboratory
who found it
Source: Wikipedia