Am
Americium · element 95
Actinide · Solid at room temperature
Americium is a radioactive transuranic chemical element with symbol Am and atomic number 95. This member of the actinide series is located in the periodic table under the lanthanide element europium, and thus by analogy was named after the Americas. Americium was first produced in 1944 by the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical laboratory of University of Chicago.
Key facts
Atomic mass
243 u
how heavy one atom is
Phase (room temp.)
Solid
Density
12 g/cm³
how tightly packed it is
Melting point
1449 K (1176 °C)
when solid turns to liquid
Boiling point
2880 K (2607 °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
1.13
how strongly it pulls electrons
Electron configuration
[Rn] 5f7 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 25 · 8 · 2
electrons in each layer, inside to out
Discovered by
Glenn T. Seaborg
who found it
Appearance
silvery white
what it looks like
Source: Wikipedia