Imagine describing the bonding in ammonia as arising by overlap of the half-filled un-hybridized 2px, 2py, and

Question:

Imagine describing the bonding in ammonia as arising by overlap of the half-filled un-hybridized 2px, 2py, and 2pz orbitals of nitrogen with the half-filled 1s orbitals of three hydrogen atoms.
(a) What kind of orbital would the unshared pair occupy?
(b) What would you expect the bond angles to be?