B
Boron · element 5
Metalloid · Solid at room temperature
Boron is a metalloid chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in both the Solar system and the Earth's crust. Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals.
Key facts
Atomic mass
10.81 u
how heavy one atom is
Phase (room temp.)
Solid
Density
2.08 g/cm³
how tightly packed it is
Melting point
2349 K (2076 °C)
when solid turns to liquid
Boiling point
4200 K (3927 °C)
when liquid turns to gas
Period
2
its row in the periodic table
Group
13
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
2.04
how strongly it pulls electrons
Electron configuration
[He] 2s2 2p1
where its electrons live
Shells
2 · 3
electrons in each layer, inside to out
Discovered by
Joseph Louis Gay-Lussac
who found it
Appearance
black-brown
what it looks like
Source: Wikipedia