Sb
Antimony · element 51
Metalloid · Solid at room temperature
Antimony is a chemical element with symbol Sb (from Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.
Key facts
Atomic mass
121.7601 u
how heavy one atom is
Phase (room temp.)
Solid
Density
6.697 g/cm³
how tightly packed it is
Melting point
903.78 K (631 °C)
when solid turns to liquid
Boiling point
1908 K (1635 °C)
when liquid turns to gas
Period
5
its row in the periodic table
Group
15
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
2.05
how strongly it pulls electrons
Electron configuration
[Kr] 4d10 5s2 5p3
where its electrons live
Shells
2 · 8 · 18 · 18 · 5
electrons in each layer, inside to out
Discovered by
unknown, before 3000 BC
who found it
Appearance
silvery lustrous gray
what it looks like
Source: Wikipedia