Question

what are the similarities in properties of elements in halogen family ?

Answer 1

in halogen family all the elements have -1 valency

Answer 2

Electronegativity: The tendency of an atom to attract electrons to itself.

halogens: Group 17 (or VII) in the periodic table consisting of fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). They share similar chemical properties.

hope it will help