Halogens have more valence electrons than alkali metals.
Alkali metals, which include elements like lithium (Li), sodium (Na), and potassium (K), have a single valence electron. They belong to Group 1 of the periodic table and have one electron in their outermost energy level (shell).
Halogens, on the other hand, belong to Group 17 of the periodic table and include elements such as fluorine (F), chlorine (Cl), and bromine (Br). Halogens have seven valence electrons. They have seven electrons in their outermost energy level (shell), just one electron short of having a complete octet (eight electrons) in their outer shell.
So, in summary, halogens have more valence electrons (seven) compared to alkali metals, which have only one valence electron.