To determine which pair of elements would likely form the least polar bonds, we can examine the differences in electronegativity for each pair:
- Nitrogen (3.0) and Oxygen (3.5): Difference = 0.5
- Bromine (2.8) and Nitrogen (3.0): Difference = 0.2
- Oxygen (3.5) and Phosphorus (2.1): Difference = 1.4
- Phosphorus (2.1) and Bromine (2.8): Difference = 0.7
The pair with the smallest difference in electronegativity will form the least polar bond.
Comparing the differences:
- Nitrogen and Oxygen: 0.5
- Bromine and Nitrogen: 0.2
- Oxygen and Phosphorus: 1.4
- Phosphorus and Bromine: 0.7
The smallest difference is 0.2 for the pair bromine and nitrogen. Therefore, bromine and nitrogen would likely form the least polar bonds with each other.