Concept: Periodic Trends: Ionization Energy.
Exothermic reactions are those that release energy. Products in an exothermic reaction have less energy than the reactants, which means that products are very stable while reactants are rather unstable. The most exothermic reaction must have the most unstable reactant. Which atom can replace "E"? To answer this question, we must figure out which given atom is most unstable as a cation.
Of the five elements Al, Cl, I, Na, Rb, which has the most exothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? Hint: note the process depicted does not correspond to electron affinity E+(g) + e− ⟶ E(g)
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