li'orkliru lujvo

x₁ is a quantity of/contains/is made of fluorine.

See also fluuori.

lensisku

In notes:

fluuori: x₁ is a quantity/is made of fluorine [F].
ri'orkliru: x₁ is chlorine.
xunkliru: x₁ is bromine.
zirkliru: x₁ is iodine.