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Helium
Beginning of paper
, symbol He, inert, colorless, odorless gaseous element. In
group 18 (or VIIIa) of the periodic table, is one of the noble gases.
The atomic number of is 2. The French astronomer Pierre Janssen
discovered in the spectrum of the corona of the sun during an
eclipse in 1868.
Helium is the lightest of all gases except hydrogen. Helium
s .... Middle of paper
.... called super fluid helium, a liquid with unique physical properties.
It has no freezing point, and its viscosity is zero; it passes readily
through minute cracks and pores and will even creep up the sides and over
the lip of a container. Helium-3, the lighter helium isotope of mass 3,
which has an even lower boiling point than ordinary helium, exhibits
markedly different properties when liquefied.
Because it is noncombustible, hel ....
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Number of words: 521
Number of pages: 2 (approx. 250 words per double-spaced page)
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