Technical data for Nitrogen

Overview Name Nitrogen Symbol N Atomic Number 7 Atomic Weight 14.007 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 63.05 K Absolute Boiling Point 77.36 K Critical Pressure 3.39 MPa (33.46 Atm) Critical Temperature 126.21 K Heat of Fusion 0.36 kJ/mol Heat of Vaporization 2.79 kJ/mol Specific Heat 1040 J/(kg K)[note] Adiabatic Index 7/5 Neel Point N/A Thermal Conductivity 0.02583 W/(m K) Thermal Expansion N/A Bulk physical properties Density 1.251 g/l[note] Density (Liquid) N/A Molar Volume 0.011197 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 333.6 m/s Thermal Conductivity 0.02583 W/(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 DOT Hazard Class 2.2 DOT Numbers 1977 RTECS Number RTECSQW9700000 NFPA Label

Classifications Alternate Names None Names of Allotropes Dinitrogen Block p Group 15 Period 2 Series Nonmetal Electron Configuration [He]2s22p3 Color Colorless Discovery 1772 in The United Kingdom Gas phase Diatomic CAS Number CAS7727-37-9 CID Number CID947 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 -5.4×10-9 m3/Kg Molar Magnetic Susceptibility -1.5×10-10 m3/mol Volume Magnetic Susceptibility -6.8×10-9 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 71 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%