r/helium

1.3K archived posts · Sep 2010 – Sep 2026

Helium

r/helium

This subreddit celebrates the element, Helium. For Helium Network discussions, join us at r/HeliumNetwork

Created Apr 18, 2010

4.8KMembers (last snapshot)

1.3KArchived posts

The Helium Reddit

Helium - a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.

After hydrogen, helium is the second lightest and second most abundant element in the observable universe, being 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 figure in the Sun and in Jupiter. This is due to the very high nuclear binding energy (per nucleon) 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. Most helium in the universe is helium-4, and is believed to have been formed during the Big Bang. Large amounts of new helium are being created by nuclear fusion of hydrogen in stars.

Wikipedia: helium

Symbol: He

Atomic mass: 4.002602 u ± 0.000002 u

Atomic number: 2

Discovered: 1868 by Janssen & Lockyer

Electron configuration: 1s^2

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