For which of the molecules
A) O2 B) O3 C) CO2 D) SO2
will dipole-dipole interactions be important?

A and B only because O2 and CO2 do not have dipole moments

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.