Draw the lewis structure for the molecule ammonia, nh, and predict the molecular geometry

Explanation:

Ammonia (NH₃)

Valence electrons of nitrogen = 5

Valence electrons of hydrogen = 1

The total number of the valence electrons  = 5 + 3(1) = 8

The Lewis structure is drawn in such a way that the octet of each atom and duet for the hydrogen in the molecule is complete. So,  

The Lewis structure is shown in the image below.

The molecular geometry is trigonal pyramidal as the central atom has one lone pair and the molecule is of the type which corresponds to trigonal pyramidal geometry.

b. atoms in metallic solids are not arranged in a regular pattern

explanation:

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.