Question

elements in the halogen family belonging to 17 group in their periodic table show similarity in their properties

Answer 1

Halogens are non metalic elements.They are highly non metallic. Elements of a group show same properties. Like flourine has atomic number 9 its ec will be 2,7 it will have 7 electrons in its outer shell so all elemernts of its group i.e. 17 will have 7 electrons in their outer shell