What is the enthalpy for the reaction
represented in the following energy
diagram?
+200 kJ
+350 kJ
potential energy
100 150 200 250 300 350 400 450 500
+150 kJ
+250 kJ
progress

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