Question

What are alkali metals ?

Are flourine and Chlorine alkali metals, if yes then why?

Answer 1

Alkali metals are elements belonging to 1st group of periodic table. Their valence shell has one electron in their outer most s- sub shell and hence they are also called s-block elements.

Chlorine and fluorine are not alkali metals. They are not metals. They fall in the 17th group of periodic table and need 1 electron to obtain noble gas configuration i.e. fully filled orbitals.