In a hydrogen fluoride (HF) molecule, a hydrogen atom and a fluorine atom are held together by a polar covalent bond. Which of the following best explains why this
bond is polar?
A the large difference in the electronegativities of hydrogen and fluorine atoms
B the large difference in the number of electrons of hydrogen and fluorine atoms
C the large difference in the atomic radii of hydrogen and fluorine atoms
D the large difference in the atomic masses of hydrogen and fluorine atoms