We’re being asked to determine the **general trend in the X-P-X angle as the electronegativity increases**.

By the VSEPR approach, trends in many bond angles can be explained by electronegativity.

We consider the given examples:

X-P-X angle

PF_{3} 96.3

PCl_{3} 101.0

PI_{3} 102.0

The phosphorus trihalides (PX_{3}) show the following variation in the bond angle X-P-X: PF_{3}, 96.3 ; , 100.3 PCl_{3} ; , 101.0 ; , 102.0 Pl_{3} . The trend is generally attributed to the change in the electronegativity of the halogen.

What is the general trend in the X-P-X angle as the electronegativity increases?

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