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Helium Element Properties, Noble Gas Group, Periodic Table of the Elements

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Helium

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Helium Element Properties

s1
H
Hydrogen
s2
He
Helium
s3
Li
Lithium
General
NameHelium
SymbolHe
Number2
Group Number18
Group Noble Gas
Blocks
Density0.0001787 g/cm3
Atomic Weight4.00260 g/mol
Atomic VolumeNil
Discover1895


States
StateGas
Melting Point0.95 K
Boiling Point4.22 K
Triple PointNil
Critical Point5.19 K
Heat of Fusion0.0138 kJ/mol
Heat of Vaporization0.0829 kJ/mol


Energies
First Ionization Energy2372.3 kJ/mole
Second Ionization Energy5250.3 kJ/mole
Third Ionization EnergyNil
ElectronegativityNil
Electron Affinity0 kJ/mole
Specific Heat5.193 J/gK
Heat Atomization0 kJ/mole atoms


Oxidation and Electrons
Shells2
Electron Configuration1s2
Minimum Oxidation Number0
Maximum Oxidation Number0
Minimum Common Oxidation Number0
Maximum Common Oxidation Number0


Appearance and Characteristics
Crystal Structurehexagonal close-packed
CharacteristicsInert, dens
Colorcolorless
Usescryogenics, blimps
Hardnessmohs
ToxicityNo


Reactions
Reaction with AirNone
Reaction with 6M HClNone
Reaction with 15M HNO3None
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes2
HydrideNone
OxideNone
ChlorideNone


Radius
Atomic Radius31 pm
Ionic Radius (1+ ion)Nil
Ionic Radius (1- ion)Nil
Ionic Radius (2+ ion)Nil
Ionic Radius (2- ion)Nil
Ionic Radius (3+ ion)Nil


Conductivity
Thermal Conductivity0.15 J/m-sec-deg
Electrical Conductivity1/mohm-cm
Polarizability0.198 A3


Abundance
SourceNatural gas, air
Relation Abundance Solar System9.435 log
Abundance Earth's Crust-2.1 log


s1
H
Hydrogen
s2
He
Helium
s3
Li
Lithium




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