Question

Discuss the shapes for the molecules NH3 and H2CO

Answer 1

What is the shape of a nh3 molecule?

The shape of NH3 is Trigonal Pyramidal. When there is one atom in the middle, and three others at the corners and all the three molecules are identical, the molecular geometry achieves the shape of trigonal pyramidal. Ammonia is having this form as the Nitrogen has 5 valence electrons and bonds with 3 Hydrogen atoms to complete the octet.

What is the shape of a  H2CO molecule?

It's a trigonal planar molecule because the carbon atom is sp2 hybridizated and forms 3 bonds. The atoms attached to it are 2 hydrogen atoms (single bond) and one oxygen (double bond). The angles between these bonds are approximately 120°.

That's the only way you can arrange these atoms.