List at least one cranio-dental characteristics that group proconsul with hominoids to the exclusion of cercopithecoids.

The two cranio-dental characteristics that group proconsul with hominoids to the exclusion of Cercopithecoids are the Y-5 and the Wider anterior palate. 
Proconsul is an extinct primate which lived approximately 23 to 17 million years ago during the Early Miocene period. It was discovered in 1909 by a gold prospector in Western Kenya, Africa. Cercopithecoids have a narrow nose and palate, and smaller brain relative to body size than Hominids. They also had tails, while Hominoids have no tails. 

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons