No such thing. Romeo and Juliet is a play. Plays do not have chapters. Novels have chapters, but it is not a novel. It's a play. Whether something is a novel or a play is hugely important to the way it is written. Plays do not have long descriptive passages. And they are divided into acts and scenes, not chapters. And Romeo and Juliet (I may have mentioned this) is a play, not a novel.