Explanation:
As the given electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}[/tex]. This shows that there are in total 35 electrons and 7 valence electrons.
Also, we know that bromine is the element that has atomic number 35. And, since it belongs to group 17 so it has 7 valence electrons.
Thus, we can conclude that the given element is bromine.
