Ar
Ar
It is 87.3 K.
There are three natural isotopes.
Argon is a non metal element. Atomic mass of it is 39.94.
Helium, Xenon, Neon, Krypton, and Radon.
For most people there is absolutely no reason to buy any argon in their lifetimes.
Argon is very unreactive as it is a noble gas. Its common oxidation number is zero.
argons, groans, orangs, organs, sarong
Ar 40 is the most common isotope, accounting for 99.6% of the total (by weight).
Argon's atomic number is 18, which means it has 18 protons in its nucleus.
Argon atoms have 18 protons which is similar to the number of electrons.
Argon is a gaseous element, and it is allowed in the TWL and SOWPODS lexicons. Also, it is definitely legal to pluralize words in Scrabble.