There are 3 books in the Perfect Chemistry series. The newest book is Chain Reaction which came out in 2011.

1
Perfect Chemistry

Book cover of Perfect Chemistry
From the New York Times bestselling author Simone Elkeles comes an epic love story like no other . . . First in the gripping PERFECT CHEMISTRY series, this is the next addictive read for fans of Anna Todd's AFTER series, and Caroline Kepnes's YOU.

When Brittany Ellis walks into chemistry…
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2
Rules of Attraction

Book cover of Rules of Attraction
From the New York Times bestselling author Simone Elkeles comes an epic love story like no other . . . The second book in the gripping PERFECT CHEMISTRY series, this is the next addictive read for fans of Anna Todd's AFTER series, and Caroline Kepnes's YOU.

Carlos Fuentes isn't happy…

3
Chain Reaction

Book cover of Chain Reaction
From the New York Times bestselling author Simone Elkeles comes an epic love story like no other . . . This is the final installment in the gripping PERFECT CHEMISTRY trilogy, and the next addictive read for fans of Anna Todd's AFTER series, and Caroline Kepnes's YOU.

Like his brothers,…