Final answer:
A molecule made of 2 atoms is linear, a molecule made of 3 atoms could be linear or angular, a molecule made of 4 atoms could be linear or tetrahedral, and a molecule made of 5 atoms can only be trigonal planar.
Step-by-step explanation:
a) A molecule made of 2 atoms can only be linear.
b) A molecule made of 3 atoms could be either linear or angular.
c) A molecule made of 4 atoms could be either linear or tetrahedral.
d) A molecule made of 5 atoms can only be trigonal planar.