Ytterbium forms both dihalides and trihalides with the halogens fluorine, chlorine, bromine, and iodine.

Is francium a halogen?

Francium is an alkali metal whose chemical properties mostly resemble those of caesium. A heavy element with a single valence electron, it has the highest equivalent weight of any element.

What is the difference between yttrium and ytterbium?

As nouns the difference between ytterbium and yttrium

is that ytterbium is a metallic chemical element (symbol yb) with an atomic number of 70 while yttrium is a metallic chemical element (symbol y) with an atomic number of 39.