Final answer:
In a hydrogen fluoride (HF) molecule, the F end is partially negative due to higher electronegativity, and the H end is partially positive, making it the positive end relative to the F end.
Step-by-step explanation:
The molecule in question is assumed to be hydrogen fluoride (HF), where hydrogen (H) is bonded to fluorine (F). In HF, fluorine has a higher electronegativity compared to hydrogen, which means it has a greater tendency to attract the bonding electrons towards itself. As a result, the electrons in the bond are closer to the F atom, making the F end of the molecule partially negative (represented as δ-).
Conversely, the H end of the molecule becomes partially positive (represented as δ+), making it the positive end relative to the F end. This separation of charge leads to what is known as a polar covalent bond, and HF is considered a polar molecule because it has two poles, which is analogous to a magnet with a north and south pole.