## Lewis Structure regarding the angles

Tiffany Wu 1K
Posts: 19
Joined: Wed Sep 21, 2016 2:56 pm

### Lewis Structure regarding the angles

For the trigonal planar, if the elements around the central are are different, how can you determine the angle of the atoms? For example, an atom makes the angle from the other atoms bigger.

JELCI_BARRAZA_1C
Posts: 17
Joined: Wed Sep 21, 2016 3:00 pm

### Lewis Structure regarding the angles

why is the angle of a structure of a atom so important? does it matter if we draw it incorrectly?

Alyssa Chan 3B
Posts: 16
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Lewis Structure regarding the angles

In class, Dr. Lavelle used the example of BF3 for a trigonal planar structure. For your case, let's say one of the F atoms is Cl. Since Cl is a bigger atom than F (thus more repulsion), it would cause the angle between the Cl and F atoms to become bigger. Knowing that the angle between atoms of a trigonal planar structure is 120˚, we can guess that the angle between Cl and F is >120˚, but we won't be able to guess the exact angle.