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Helium (from Gr****: ἥλιος, romanized: helios, lit. 'sun') is a
chemical element; it has
symbol He and
atomic number 2. It is a colorless, odorless, non-toxic...
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Helium-3 (3He see also helion) is a light,
stable isotope of
helium with two
protons and one neutron. (In contrast, the most
common isotope,
helium-4...
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referred to as aerogens) are the
members of
group 18 of the
periodic table:
helium (He), neon (Ne),
argon (Ar),
krypton (Kr),
xenon (Xe),
radon (Rn) and, in...
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Helium (2He) (standard
atomic weight: 4.002602(2)) has nine
known isotopes, but only
helium-3 (3He) and
helium-4 (4He) are stable. All
radioisotopes are...
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helium Helium-3
Helium-4
Helium (band),
American rock band
Helium (Pram album), 1994
Helium (H3llb3nt album), 1998
Helium (Homeshake album) "
Helium" (Sia...
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Helium-4 (4 He) is a
stable isotope of the
element helium. It is by far the more
abundant of the two
naturally occurring isotopes of
helium,
making up...
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Liquid helium is a
physical state of
helium at very low
temperatures at
standard atmospheric pressures.
Liquid helium may show superfluidity. At standard...
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helium release valve,
helium escape valve or gas
escape valve is a
feature found on some
diving watches intended for
saturation diving using helium based...
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Superfluid helium-4 (
helium II or He-II) is the
superfluid form of
helium-4, the most
common isotope of the
element helium. The substance,
which resembles...
- three-quarters of the Sun's m****
consists of
hydrogen (~73%); the rest is
mostly helium (~25%), with much
smaller quantities of
heavier elements,
including oxygen...
