Problem: 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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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. 

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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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Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends: Ionization Energy concept. You can view video lessons to learn Periodic Trends: Ionization Energy. Or if you need more Periodic Trends: Ionization Energy practice, you can also practice Periodic Trends: Ionization Energy practice problems.

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Based on our data, we think this problem is relevant for Professor West's class at UGA.

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Our data indicates that this problem or a close variation was asked in Chemistry - OpenStax 2015th Edition. You can also practice Chemistry - OpenStax 2015th Edition practice problems.