Is the entire story of romeo and Juliet written in iambic pentameter?

No, not the entire story of Romeo and Juliet is written in iambic pentameter. While Shakespeare's play primarily uses iambic pentameter, there are instances where he deviates from this pattern for specific dramatic effects or to create variations in rhythm and speech. These deviations can include the use of other metrical patterns, such as trochaic meter or blank verse (unrhymed iambic pentameter), as well as the incorporation of prose sections.