Question

NH₃

1A) The structure of NH₃ has how many electron domains?
a) 6 electron domains
b) 2 electron domains
c) need more information
d) 4 electron domains

1B) NH₃ has how many lone pairs on the central atom?
a) 2 lone pairs
b) 4 lone pairs
c) 1 lone pair
d) 0 lone pairs

1C) What is the electron domain geometry of NH₃?
a) trigonal bipyramidal
b) octahedral
c) tetrahedral
d) square planar

1D) What is the molecular geometry of NH₃?
a) trigonal planar
b) trigonal pyramidal
c) tetrahedral
d) trigonal bipyramdial

Answer 1

1A. The NH₃ atom has 3 bond pair electrons(N-H bonds) and 1 lone pair of electrons. Hence it has 4 electron domains.

1B. As stated above, Nitrogen has 1 lone pair.

1C. Since the electron domains are 4 in number, it corresponds to Tetrahedral geometry.

1D. Since the lone pair does not appear in geometry, the actual shape of NH₃ is a trigonal pyramidal (one spot in tetrahedron is unoccupied)