Technical data for Sodium

Overview Name Sodium Symbol Na Atomic Number 11 Atomic Weight 22.98976928 Density 0.968 g/cm3 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 370.87 K Absolute Boiling Point 1156 K Critical Pressure 35 MPa (345.4 Atm)[note] Critical Temperature 2573 K[note] Heat of Fusion 2.6 kJ/mol Heat of Vaporization 97.7 kJ/mol Specific Heat 1230 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 140 W/(m K) Thermal Expansion 0.00007 K-1 Bulk physical properties Density 0.968 g/cm3 Density (Liquid) 0.927 g/cm3 Molar Volume 0.00002375 Brinell Hardness 0.69 MPa Mohs Hardness 0.5 Vickers Hardness N/A Bulk Modulus 6.3 GPa Shear Modulus 3.3 GPa Young Modulus 10 GPa Poisson Ratio N/A Refractive Index N/A Speed of Sound 3200 m/s Thermal Conductivity 140 W/(m K) Thermal Expansion 0.00007 K-1 Reactivity Valence 1 Electronegativity 0.93 ElectronAffinity 52.8 kJ/mol Ionization Energies 495.8, 4562, 6910.3, 9543, 13354, 16613, 20117, 25496, 28932, 141362 kJ/mol Health and Safety DOT Hazard Class 4.3 DOT Numbers 1428 RTECS Number RTECSVY0686000 NFPA Label

Classifications Alternate Names Natrium Names of Allotropes None Block s Group 1 Period 3 Series Alkali Metal Electron Configuration [Ne]3s1 Color Silver Discovery 1807 in The United Kingdom Gas phase N/A CAS Number CAS7440-23-5 CID Number CID5360545 RTECS Number RTECSVY0686000 Electrical properties Electrical Type Conductor Electrical Conductivity 2.1×107 S/m Resistivity 4.699999999998×10-8 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 8.8×10-9 m3/Kg Molar Magnetic Susceptibility 2×10-10 m3/mol Volume Magnetic Susceptibility 8.6×10-6 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 166 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%