Determine the electron pair shape and molecular structure

Question

Determine the electron pair shape and molecular structure of the following molecules. Also, indicate if the molecule is polar or nonpolar.

 

A. PF₃

B. SeBr₄

C. H₂S

D. AsH₃

E. SiH₄

Answer 1

This requires us to know how to draw the Lewis structure, which is difficult to do on this platform, but I'll describe it best I can. Review if necessary.

A) PF₃ ... P in center with 3 F atoms attached. Each F has 3 lone pairs and the P has 1 lone pair of electrons. Electron geometry = tetrahedral. Molecular shape = trigonal pyramidal. It is polar.

B) SeBr₄ ... Se in center with 4 Br atoms attached. Each Br has 3 lone pairs of electrons, and the Se has 1 lone pair (expanded octet). Electron geometry = trigonal bipyramidal. Molecular shape = seesaw

You should try the rest. If you can't figure them out, post another question with those only.