Elemental Gas

An Elemental Gas is a group stable homonuclear molecules at standard temperature and pressure.

• AKA: Molecular Gas.
• Example(s):
  • Hydrogen-2 (H2),
  • Nitrogen-2 (N2),
  • Oxygen-2 (O2),
  • Fluorine-2 (F2),
  • Chlorine-2 (Cl2).
  • …
• Counter-Example(s):
  • A Noble Gas.
• See: Chemical Compound, Chemical Element, Homonuclear Molecule, Standard Temperature And Pressure, Hydrogen, Nitrogen, Oxygen, Halogen, Fluorine, Chlorine, Monatomic Gas.

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References

2017

• (Wikipedia, 2017) ⇒ https://en.wikipedia.org/wiki/Gas#Elemental_gases Retrieved:2017-7-9.
  • The only chemical elements which are stable multi atom homonuclear molecules at standard temperature and pressure (STP), are hydrogen (H₂), nitrogen (N₂) and oxygen (O₂);

    plus two halogens, fluorine (F₂) and chlorine (Cl₂).

    These gases, when grouped together with the monatomic noble gases; which are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn) ; are called "elemental gases". Alternatively they are sometimes known as "molecular gases" to distinguish them from molecules that are also chemical compounds.

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