To determine which pair of elements would likely form the least polar bonds, we can look at the electronegativity values provided:
- Bromine (Br): 2.8
- Oxygen (O): 3.5
- Nitrogen (N): 3.0
- Phosphorus (P): 2.1
The polarity of a bond is determined by the difference in electronegativity between the two elements in the bond. A smaller difference in electronegativity indicates a less polar bond.
Now let's calculate the electronegativity differences for each pair:
-
Phosphorus and Bromine:
\( |2.8 - 2.1| = 0.7 \) -
Oxygen and Phosphorus:
\( |3.5 - 2.1| = 1.4 \) -
Nitrogen and Oxygen:
\( |3.5 - 3.0| = 0.5 \) -
Bromine and Nitrogen:
\( |3.0 - 2.8| = 0.2 \)
Now, we compare the differences:
- Phosphorus and Bromine: 0.7
- Oxygen and Phosphorus: 1.4
- Nitrogen and Oxygen: 0.5
- Bromine and Nitrogen: 0.2
The pair with the smallest electronegativity difference is Bromine and Nitrogen (0.2), which suggests that they would likely form the least polar bonds with each other.