Final answer:
The type of bonding between atoms is determined by their electronegativity difference. If the electronegativity difference is very small, a nonpolar covalent bond is formed. If the electronegativity difference is moderate, a polar covalent bond is formed. And if the electronegativity difference is large, an ionic bond is formed.
Step-by-step explanation:
The type of bonding between atoms is determined by their electronegativity difference. If the electronegativity difference is very small, a nonpolar covalent bond is formed. If the electronegativity difference is moderate, a polar covalent bond is formed. And if the electronegativity difference is large, an ionic bond is formed.
Using the Pauling electronegativity values, we can determine the type of bonding for each pair of atoms:
F and S: The electronegativity difference is small (0.4), so a nonpolar covalent bond is most likely to occur.
K and Br: The electronegativity difference is moderate (0.7), so a polar covalent bond is most likely to occur.
Ar and H: The electronegativity difference is large (2.5), so an ionic bond is most likely to occur.