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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
solidifies ....
Middle of paper
....which has an even lower boiling point than ordinary helium, exhibits
markedly different properties when liquefied.
Because it is noncombustible, helium is preferred to hydrogen as
the lifting gas in lighter-than-air balloons; it has 92 percent of the
lifting power of hydrogen, although it weighs twice as much. Helium is used
to pressurize a.... |
| Word count: 521 |
Page count: 2 |
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