Which of the following is a part of the heliocentric model? all objects in space move around earth in perfect circles. all objects in space move around the sun. all objects in space move in parallel tracks. all objects in space are perfect spheres.

The Heliocentric system is a model whereby the sun is assumed to be in the middle of the solar system and all the other objects including the Earth move or revolve around it.This method opposed the earlier model of Geocentrism which proposed that the Earth was lying at the centre and all the other objects revolved around it.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf