Na
Sodium · element 11
Alkali Metal · Solid at room temperature
Sodium /ˈsoʊdiəm/ is a chemical element with symbol Na (from Ancient Greek Νάτριο) and atomic number 11. It is a soft, silver-white, highly reactive metal. In the Periodic table it is in column 1 (alkali metals), and shares with the other six elements in that column that it has a single electron in its outer shell, which it readily donates, creating a positively charged atom - a cation.
Key facts
Atomic mass
22.989769282 u
how heavy one atom is
Phase (room temp.)
Solid
Density
0.968 g/cm³
how tightly packed it is
Melting point
370.944 K (98 °C)
when solid turns to liquid
Boiling point
1156.09 K (883 °C)
when liquid turns to gas
Period
3
its row in the periodic table
Group
1
its column in the periodic table
Block
S-block
the neighbourhood it lives in
Electronegativity
0.93
how strongly it pulls electrons
Electron configuration
[Ne] 3s1
where its electrons live
Shells
2 · 8 · 1
electrons in each layer, inside to out
Discovered by
Humphry Davy
who found it
Appearance
silvery white metallic
what it looks like
Source: Wikipedia