The noble gases always exist in monatomic form: Helium, Neon, Argon, Krypton, Xenon, and Radon.
Nitrogen (N2) is the Group 15 element that exists as diatomic molecules at standard temperature and pressure (STP).
No, fluorine is a diatomic gas at standard temperature and pressure (STP), meaning it exists as F2 molecules, not as single F atoms.
iodine
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Argon is a gas at STP. It becomes a liquid below -186oC and solid below -190oC at StP
Nitrogen (N2) is the Group 15 element that exists as diatomic molecules at standard temperature and pressure (STP).
No, fluorine is a diatomic gas at standard temperature and pressure (STP), meaning it exists as F2 molecules, not as single F atoms.
iodine
Nonpolar molecules
Helium exists as a gas at STP
Helium is a chemical element and a noble gas, which is a type of matter that exists in a gaseous state at room temperature and pressure.
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At standard temperature and pressure (STP), aluminum bromide exists as a solid.
Argon is a gas at STP. It becomes a liquid below -186oC and solid below -190oC at StP
Bromine is a chemical element and a liquid at room temperature, so it can be a solution when dissolved in a solvent like water or organic solvents. It is commonly used as a reagent in chemical reactions and as a disinfectant.
Helium comes very close to ideal at STP since it is so small and monatomic. In reality most gases are pretty indistinguishable from ideal at STP because the molecules are so far apart that their individual volumes are negligible compared to the space they are in and the molecules are so far apart that they exert negligible force on each other.
A gas at STP.