Technical data for Nitrogen

Overview Name Nitrogen Symbol N Atomic Number 7 Atomic Weight 14.0067 Density 1.251 g/l[note] Melting Point -210.1°C Boiling Point -195.79°C Thermal properties Phase Gas Melting Point -210.1°C Boiling Point -195.79°C Absolute Melting Point 63.05K Absolute Boiling Point 77.36K Critical Pressure 3.39MPa (33.46Atm) Critical Temperature 126.21K Heat of Fusion 0.36KJ/mol Heat of Vaporization 2.79KJ/mol Heat of Combustion N/A Specific Heat 1040.J/(Kg K)[note] Adiabatic Index 7/5 Neel Point N/A Thermal Conductivity 0.02583W/(m K) Thermal Expansion N/A Bulk physical properties Density 1.251 g/l[note] Density (Liquid) N/A Molar Volume 0.011196 Brinell Hardness N/A Mohs Hardness N/A Vickers Hardness N/A Bulk Modulus N/A Shear Modulus N/A Young Modulus N/A Poisson Ratio N/A Refractive Index 1.000298 Speed of Sound 333.6m/s Thermal Conductivity 0.02583W/(m K) Thermal Expansion N/A Reactivity Valence 3 Electronegativity 3.04 ElectronAffinity 7.KJ/mol Ionization Energies 1402.3, 2856., 4578.1, 7475., 9444.9, 53266.6, 64360. KJ/mol Health and Safety Autoignition Point N/A Flashpoint N/A Heat of Combustion N/A DOT Hazard Class 2.2 DOT Numbers 1977 EU Number EU231-783-9 NFPA Fire Rating 0 NFPA Hazards N/A NFPA Health Rating 3 NFPA Reactivity Rating 0 RTECS Classes Other RTECS Number RTECSQW9700000 NFPA Label

Classifications Alternate Names None Names of Allotropes Dinitrogen Block p Group 15 Period 2 Electron Configuration [He]2s22p3 Color Colorless Discovery 1772 in United Kingdom Gas phase Diatomic CAS Number CAS7727-37-9 CID Number CID947 Gmelin Number Gmelin150 NSC Number N/A RTECS Number RTECSQW9700000 Electrical properties Electrical Type N/A Electrical Conductivity N/A Resistivity N/A Superconducting Point N/A Magnetic properties Magnetic Type Diamagnetic Curie Point N/A Mass Magnetic Susceptibility -1.×10-8 Molar Magnetic Susceptibility -1.401×10-10 Volume Magnetic Susceptibility -1.251×10-8 Abundances % in Universe 0.1% % in Sun 0.1% % in Meteorites 0.14% % in Earth's Crust 0.002% % in Oceans 0.00005% % in Humans 2.6% Atomic dimensions and structure Atomic Radius 56.pm Covalent Radius 75.pm Van der Waals Radius 155.pm Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 386.1, 386.1, 626.5 pm Space Group Name P63/mmc Space Group Number 194 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 4S3/2 Neutron Cross Section 1.91 Neutron Mass Absorption 0.0048 Known Isotopes 10N, 11N, 12N, 13N, 14N, 15N, 16N, 17N, 18N, 19N, 20N, 21N, 22N, 23N, 24N, 25N Stable Isotopes 14N, 15N Isotopic Abundances 14N 99.632% 15N 0.368%