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Technical data for Sodium

Click any property name to see plots of that property for all the elements.

Overview
NameSodium
SymbolNa
Atomic Number11
Atomic Weight22.98977
Density0.968 g/cm3
Melting Point97.72 °C
Boiling Point883 °C

Thermal properties
PhaseSolid
Melting Point97.72 °C
Boiling Point883 °C
Absolute Melting Point370.87 K
Absolute Boiling Point1156 K
Critical Pressure35 MPa (345.4 Atm)[note]
Critical Temperature2573 K[note]
Heat of Fusion2.6 kJ/mol
Heat of Vaporization97.7 kJ/mol
Heat of CombustionN/A
Specific Heat1230 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity140 W/(m K)
Thermal Expansion0.000071 K-1

Bulk physical properties
Density0.968 g/cm3
Density (Liquid)0.927 g/cm3
Molar Volume0.00002375
Brinell Hardness0.69 MPa
Mohs Hardness0.5 MPa
Vickers HardnessN/A
Bulk Modulus6.3 GPa
Shear Modulus3.3 GPa
Young Modulus10 GPa
Poisson RatioN/A
Refractive IndexN/A
Speed of Sound3.2×103 m/s
Thermal Conductivity140 W/(m K)
Thermal Expansion0.000071 K-1

Reactivity
Valence1
Electronegativity0.93
ElectronAffinity52.8 kJ/mol
Ionization Energies
495.8, 4562, 6910.3, 9543, 13354, 16613, 20117, 25496, 28932, 141362 kJ/mol

Health and Safety
Autoignition Point115 °C
Flashpoint4 °C
Heat of CombustionN/A
DOT Hazard Class4.3
DOT Numbers1428
EU NumberN/A
NFPA Fire Rating3
NFPA Hazards
Water Reactive
NFPA Health Rating3
NFPA Reactivity Rating2
RTECS NumberRTECSVY0686000
NFPA LabelNFPA Label

Classifications
Alternate NamesNatrium
Names of AllotropesNone
Blocks
Group1
Period3
Electron Configuration[Ne]3s1
ColorSilver
Discovery
1807 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-23-5
CID NumberCID5360545
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSVY0686000

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.1×107 S/m
Resistivity4.7×10-8 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility8.8×10-9
Molar Magnetic Susceptibility2×10-10
Volume Magnetic Susceptibility8.5×10-6

Abundances
% in Universe0.002%
% in Sun0.004%
% in Meteorites0.55%
% in Earth's Crust2.3%
% in Oceans1.1%
% in Humans0.14%

Atomic dimensions and structure
Atomic Radius190 pm
Covalent Radius154 pm
Van der Waals Radius227 pm
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
429.06, 429.06, 429.06 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers2S1/2
Neutron Cross Section0.53
Neutron Mass Absorption0.0007
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
23Na100%


Notes on the properties of Sodium:

Critical Pressure: Value estimated based on extrapolation.

Critical Temperature: Value estimated based on extrapolation.

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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