1. Under what conditions can potassium bromide conduct electricity? A only when melted
B. when melted or dissolved in water
C. only when it is in crystal form
D. only when dissolved

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals