Mt
Meitnerium · element 109
Unknown, Probably Transition Metal · Solid at room temperature
Meitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.
Key facts
Atomic mass
278 u
how heavy one atom is
Phase (room temp.)
Solid
Density
37.4 g/cm³
how tightly packed it is
Period
7
its row in the periodic table
Group
9
its column in the periodic table
Block
D-block
the neighbourhood it lives in
Electron configuration
*[Rn] 5f14 6d7 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 32 · 15 · 2
electrons in each layer, inside to out
Discovered by
Gesellschaft für Schwerionenforschung
who found it
Source: Wikipedia