To determine which pair of elements would likely form the least polar bonds, we need to look at the difference in electronegativity between the pairs.
The electronegativities are as follows:
- Bromine: 2.8
- Oxygen: 3.5
- Nitrogen: 3.0
- Phosphorus: 2.1
Now, let's calculate the differences for each option:
- Nitrogen and Oxygen: |3.0 - 3.5| = 0.5
- Oxygen and Phosphorus: |3.5 - 2.1| = 1.4
- Bromine and Nitrogen: |2.8 - 3.0| = 0.2
- Phosphorus and Bromine: |2.1 - 2.8| = 0.7
The pair with the smallest difference in electronegativity is Bromine and Nitrogen (0.2), indicating they would form the least polar bonds with each other.
Thus, the answer is:
bromine and nitrogen.
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