Difference between revisions of "Helium"

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This element has two stable isotopes: 3 and 4.   
 
This element has two stable isotopes: 3 and 4.   
 
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Helium is the second element in the periodic table.  It is a noble gas.
  
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Helium consists of two isotopes.  The most common isotope, Helium-4, has a nucleus of two protons and two neutrons, and two electrons.  The less common isotope [[Helium3 | Helium-3]] has two protons and one neutron.
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Helium is a component of the [[solar wind]], and hence is found (in parts per million level) in [[Lunar regolith]].
  
  

Revision as of 14:37, 13 February 2007

Helium
He
In situ availability: trace
Necessity:
Atomic number: 2
Atomic mass: 4.002602
group: 18
period: 1
normal phase: Gas
series: Noble gases
density: 0.1786 g/L
melting point: 0.95K,
-272.2°C,
-458.0°F
boiling point: 4.22K,
-268.93°C,
-452.07°F
N/AN/AN/A
H ← He → Li
FNeN/A
Atomic radius (pm): 31 pm
Bohr radius (pm):
Covalent radius (pm): 32
Van der Waals radius (pm): 140
ionic radius (pm): -
1st ion potential (eV): 24.59
Electron Configuration
1s2
Electrons Per Shell
2
Electronegativity:
Electron Affinity: Unstable anion
Oxidation states: -
Magnetism:
Crystal structure: Hexagonal or body centered cubic

Helium is a Noble gas in group 18. It has a Hexagonal or body centered cubic crystalline structure. This element has two stable isotopes: 3 and 4.

Helium is the second element in the periodic table. It is a noble gas.

Helium consists of two isotopes. The most common isotope, Helium-4, has a nucleus of two protons and two neutrons, and two electrons. The less common isotope Helium-3 has two protons and one neutron.

Helium is a component of the solar wind, and hence is found (in parts per million level) in Lunar regolith.



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