what is helium symbol

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Helium is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its …
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Helium is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements, and it does not have a melting point at standard pressures. It is the second-lightest and second most abundant element in the observable universe, after hydrogen. It is present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. Its abundance is similar to this in both the Sun and Jupiter, because of the very high nuclear binding energy of helium-4, with respect to the next three elements after helium. This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. The most common isotope of helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. Large amounts of new helium are created by nuclear fusion of hydrogen in stars.
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Timeline
1868
Helium discovered in the sun's spectrum
1895
Helium detected on Earth in uranium ore
1913
Niels Bohr incorporates helium into his atomic model
1925
Helium Act establishes US federal reserve of helium gas
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The atmosphere of our Earth has only 0.0005% of its volume as Helium.
The United States produces about 75 percent of the world's helium, with Qatar coming in second.
Helium gas when ionized, gives a glow of reddish-orange hew.
Helium was first discovered not on Earth, but in the Sun. In 1868 French astronomer Pierre Janssen (1824-1907) studied light from the Sun during a solar eclipse.
The name of Helium comes from Helios – the Greek sun god.
Common use
In medicine, sometimes helium is used to aid patients with lung issues like obstructed airways, asthma and COPD.
It is also used in car airbags, high-tech equipment, medical devices and aircraft.
Helium-neon gas lasers are used to scan barcodes in supermarket checkouts.
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Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest and most abundant element in the universe, and forms diatomic molecules with a very low boiling and melting point. It is also non-toxic, odorless, colorless and highly flammable.
hydrogen
Nitrogen is a chemical element with the symbol N and atomic number 7. It is the most common element in the Earth's atmosphere, and forms diatomic molecules with a very low boiling and melting point. It is also non-toxic, odorless, colorless and inert.
nitrogen
Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest and most electronegative halogen, and forms diatomic molecules with a very low boiling and melting point. It is also highly toxic, corrosive, reactive and pale yellow.
fluorine
Oxygen is a chemical element with the symbol O and atomic number 8. It is the second most abundant element in the universe, and forms diatomic molecules with a very low boiling and melting point. It is also essential for life, odorless, colorless and reactive.
oxygen
Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a halogen and forms diatomic molecules with a very low boiling and melting point. It is also highly toxic, corrosive, reactive and greenish-yellow.
chlorine
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