A bunch of elements can have 18 neutrons because of isotopes in the world
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Argon belongs to the noble gas group (Group 18) on the periodic table.
argon
group 18
Argon is the 18th element in the periodic table. It is a noble gas with the atomic number 18 and symbol Ar.
Helium is located in group 18, also known as the noble gases group, on the periodic table.