Question

1. what is similar about the valence shell in the halogens family?

Explanation:

Elements in the halogen family (Group 17 in the periodic table) have 7 electrons in their out - most or valence shell. This common number of valence electrons gives them similar chemical reactivity as they tend to gain one electron to achieve a stable noble - gas electron configuration.

Answer:

All elements in the halogen family have 7 valence electrons.