It is a period 3 element.
Period#5
5
The abbreviation for number is No. (has a period at the end). Numbers plural is Nos. (again a period at the end).
Argon is a period 3 element.
The number with 652 in the ones period and 739 in the thousands period is 739,652. In this representation, "739" indicates the thousands, while "652" represents the ones. Therefore, the full number combines these two parts seamlessly.
There are three natural isotopes.
Argon's atomic number is 18, which means it has 18 protons in its nucleus.
Argon is very unreactive as it is a noble gas. Its common oxidation number is zero.
Ar
It is 87.3 K.
Argon atoms have 18 protons which is similar to the number of electrons.
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.
argons, groans, orangs, organs, sarong
Ar 40 is the most common isotope, accounting for 99.6% of the total (by weight).
Bariums period number is 6.