Helium Element Properties

Helium

s1
H
Hydrogen
s2
He
Helium
s3
Li
Lithium
General
Name(Helium)
Symbol(He)
Number(2)
Group Number(18)
Group( Noble Gas)
Block(s)
Density(0.0001787 g/cm3)
Atomic Weight(4.00260 g/mol)
Atomic Volume(Nil)
Discover(1895)


States
State(Gas)
Melting Point(0.95 K)
Boiling Point(4.22 K)
Triple Point(Nil)
Critical Point(5.19 K)
Heat of Fusion(0.0138 kJ/mol)
Heat of Vaporization(0.0829 kJ/mol)


Energies
First Ionization Energy(2372.3 kJ/mole)
Second Ionization Energy(5250.3 kJ/mole)
Third Ionization Energy(Nil)
Electronegativity(Nil)
Electron Affinity(0 kJ/mole)
Specific Heat(5.193 J/gK)
Heat Atomization(0 kJ/mole atoms)


Oxidation and Electrons
Shells(2)
Electron Configuration(1s2)
Minimum Oxidation Number(0)
Maximum Oxidation Number(0)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(0)


Appearance and Characteristics
Crystal Structure(hexagonal close-packed)
Characteristics(Inert, dens)
Color(colorless)
Uses(cryogenics, blimps)
Hardness(mohs)
Toxicity(No)


Reactions
Reaction with Air(None)
Reaction with 6M HCl(None)
Reaction with 15M HNO3(None)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(2)
Hydride(None)
Oxide(None)
Chloride(None)


Radius
Atomic Radius(31 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 Conductivity(0.15 J/m-sec-deg)
Electrical Conductivity(1/mohm-cm)
Polarizability(0.198 A3)


Abundance
Source(Natural gas, air)
Relation Abundance Solar System(9.435 log)
Abundance Earths Crust(-2.1 log)


s1
H
Hydrogen
s2
He
Helium
s3
Li
Lithium

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