Technical data for Sodium

Overview Name Sodium Symbol Na Atomic Number 11 Atomic Weight 22.98977 Density 0.968 g/cc Melting Point 97.72°C Boiling Point 883.°C Thermal properties Phase Solid Melting Point 97.72°C Boiling Point 883.°C Absolute Melting Point 370.87K Absolute Boiling Point 1156.K Critical Pressure 35.MPa (345.4Atm)[note] Critical Temperature 2573.K[note] Heat of Fusion 2.6KJ/mol Heat of Vaporization 97.7KJ/mol Heat of Combustion N/A Specific Heat 1230.J/(Kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 140.W/(m K) Thermal Expansion 0.000071K-1 Bulk physical properties Density 0.968 g/cc Density (Liquid) 0.927 g/cc Molar Volume 0.00002375 Brinell Hardness 0.69MPa Mohs Hardness 0.5MPa Vickers Hardness N/A Bulk Modulus 6.3GPa Shear Modulus 3.3GPa Young Modulus 10.GPa Poisson Ratio N/A Refractive Index N/A Speed of Sound 3.2×103m/s Thermal Conductivity 140.W/(m K) Thermal Expansion 0.000071K-1 Reactivity Valence 1 Electronegativity 0.93 ElectronAffinity 52.8KJ/mol Ionization Energies 495.8, 4562., 6910.3, 9543., 13354., 16613., 20117., 25496., 28932., 141362. KJ/mol Health and Safety Autoignition Point 115.°C Flashpoint 4.°C Heat of Combustion N/A DOT Hazard Class 4.3 DOT Numbers 1428 EU Number EU231-132-9 NFPA Fire Rating 3 NFPA Hazards Water Reactive NFPA Health Rating 3 NFPA Reactivity Rating 2 RTECS Classes Other RTECS Number RTECSVY0686000 NFPA Label

Classifications Alternate Names Natrium Names of Allotropes None Block s Group 1 Period 3 Electron Configuration [Ne]3s1 Color Silver Discovery 1807 in United Kingdom Gas phase N/A CAS Number CAS7440-23-5 CID Number CID923 Gmelin Number Gmelin563 NSC Number N/A RTECS Number RTECSVY0686000 Electrical properties Electrical Type Conductor Electrical Conductivity 2.1×107S/m Resistivity 4.7×10-8m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 6.4×10-9 Molar Magnetic Susceptibility 1.47×10-10 Volume Magnetic Susceptibility 6.2×10-6 Abundances % in Universe 0.002% % in Sun 0.004% % in Meteorites 0.55% % in Earth's Crust 2.3% % in Oceans 1.1% % in Humans 0.14% Atomic dimensions and structure Atomic Radius 190.pm Covalent Radius 154.pm Van der Waals Radius 227.pm Crystal Structure Body Centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 429.06, 429.06, 429.06 pm Space Group Name Im_ 3m Space Group Number 229 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 2S1/2 Neutron Cross Section 0.53 Neutron Mass Absorption 0.0007 Known Isotopes 18Na, 19Na, 20Na, 21Na, 22Na, 23Na, 24Na, 25Na, 26Na, 27Na, 28Na, 29Na, 30Na, 31Na, 32Na, 33Na, 34Na, 35Na, 36Na, 37Na Stable Isotopes 23Na Isotopic Abundances 23Na 100.%