AsF3 is arsenic trifluoride.
The scientific name for AsF3 is arsenic trifluoride.
It is a polar molecule and has polar bonds.
It is a polar molecule and has polar bonds.
Assuming that the questioner meant "trifluoride" instead of "trifluride", there are four total atoms in the formula unit, AsF3.
The compound AsF5 is arsenic pentafluoride.
Trigonal pyramidal. As has 5 valence electrons. It forms single bonds with each of the F atoms, donating one electron to each bond. This leaves 2 unbonded electrons, or a single lone pair. Thus the molecule has 4 different groups attached to As, and the electron configuration is tetrahedral. A tetrahedral configuration with one lone pair results in a trigonal pyramidal molecular geometry.