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11Na22.990
Sodium
Alkali MetalSodium /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.
Phase: SolidAppearance: silvery white metallic
2, 8, 1
Physical Properties
Atomic Mass22.989769282 u
Density0.968 g/cm³
Melting Point370.944 K
Boiling Point1156.09 K
Molar Heat28.23 J/(mol·K)
Period3
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s1
Semantic Config[Ne] 3s1
Shells2, 8, 1
Electron Affinity52.867 kJ/mol
Electronegativity0.93
Ionization Energies
IE1: 495.8 kJ/molIE2: 4562 kJ/molIE3: 6910.3 kJ/molIE4: 9543 kJ/molIE5: 13354 kJ/molIE6: 16613 kJ/molIE7: 20117 kJ/molIE8: 25496 kJ/molIE9: 28932 kJ/molIE10: 141362 kJ/molIE11: 159076 kJ/mol
Discovery
Discovered byHumphry Davy