General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Sodium Symbol Na
atomic number 11 Atomic weight 22.98977
Density @ 293 K 0.971 g/cm3 Atomic volume 23.7 cm3/mol
Group Alkali Met. discovered 1807


state (s, l, g) s
melting point 371.01 K boiling point 1154.6 K
Heat of fusion 2.598 kJ/mol Heat of vaporization 96.960 kJ/mol
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1st ionization energy 495.8 kJ/mole electronegativity 0.93
2nd ionization energy 4562.4 kJ/mole electron affinity 52.868 kJ/mole
3rd ionization energy 6912.2 kJ/mole Specific heat 1.23 J/gK
heat atomization 109 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,1 electron configuration [Ne] 3s1
minimum oxidation number -1 maximum oxidation number 1
min. common oxidation no. 0 max. common oxidation no. 1
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Appearance & Characteristics

structure bcc: body-centered cubic color silvery
uses lamps, table salt toxicity
hardness 0.4 mohs characteristics soft


reaction with air vigorous, = Na2O2 reaction with 6M HCl vigorous, = H2, NaCl
reaction with 6M HCl vigorous, = H2, NaCl reaction with 15M HNO3 vigorous, = NaNO3, NOx
reaction with 6M NaOH vigorous, = H2, NaOH
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Other Forms

number of isotopes 1 hydride(s) NaH
oxide(s) Na2O chloride(s) NaCl


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 186 pm ionic radius (1+ ion) 116 pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity 142 J/m-sec-deg electrical conductivity 209.6 1/mohm-cm
polarizability 23.6 A^3


source Halite (misc) rel. abund. solar system 4.759 log
abundance earth's crust 4.4 log cost, pure 7 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.