11 - Sodium alkali metal

Discovered by Humphry Davy in 1807

  • Atomic Radius (Å)
  • Cividis
Sodium

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.

H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
 Shell Electrons Orbitals
122 in 1s
282 in 2s + 6 in 2p
311 in 3s
SodiumNaElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1
silvery white metallic Appearance
23  u Atomic Mass
1.8  Å Atomic Radius
1.16k  K Boiling Point
1 Group
1 Common Oxidation States
1.66  Å Covalent Radius
0.968  g/cm³ Density
52.9  kJ/mol Electron Affinity
1s2 2s2 2p6 3s1 Electron Configuration
[Ne] 3s1 Electron Configuration (semantic)
0.93 Electronegativity
11 Electrons
5.14  eV First Ionization Energy
1 ICSD Oxidation States
495.8, 4562, 6910.3, 9543, 13354, 16613, 20117, 25496, 28932, 141362, 159076  kJ/mol Ionization Energies
371  K Melting Point
11 Mendeleev Number
28.2  J/(mol·K) Molar Heat
3 Number of Shells
1 Electron Valency
12 Neutrons
11 Atomic Number
7 Number of Isotopes
-1, 1 Oxidation States
3 Period
Solid Phase
11 Protons
2, 8, 1 Electron Shell Occupations
1.23  J/(g K) Specific Heat