Is fluorine an alkali

NO!!!!

Fluorine is an elemental gas in the HALOGEN Group.

The Word 'halogen' is from Latin and means 'salt maker'. So when fluorine is combined with a Group (I) or (II) metal (Alkali/Alkali Earth Metal) ot forms a salt.

e.g.

2Na(s) + F^(2)(g) = 2NaF(s) ( The chemical salt).