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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, tasteless...
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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 has...
- are the
naturally occurring members of
group 18 of the
periodic table:
helium (He), neon (Ne),
argon (Ar),
krypton (Kr),
xenon (Xe), and
radon (Rn). Under...
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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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there are nine
known isotopes of
helium (2He) (standard
atomic weight: 4.002602(2)), only
helium-3 (3 He ) and
helium-4 (4 He ) are stable. All radioisotopes...
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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...
- A
helium atom is an atom of the
chemical element helium.
Helium is
composed of two
electrons bound by the
electromagnetic force to a
nucleus containing...
-
helium Helium-3
Helium-4
Helium (band),
American rock band
Helium (Pram album), 1994
Helium (H3llb3nt album), 1998
Helium (Homeshake album) "
Helium" (Sia...
- 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...
-
protons and two
neutrons bound together into a
particle identical to a
helium-4 nucleus. They are
generally produced in the
process of
alpha decay but...
