Which bond in each pair is more polar? Select the single best answer for each part.
Note: Reference the Periodic Table for the electronegativity values. N-Br
In order to determine which bond in each pair is more polar, we need to compare the electronegativity values of the atoms involved.
The electronegativity value of nitrogen (N) is 3.04, and the electronegativity value of bromine (Br) is 2.96.
Since electronegativity increases as we move across a period from left to right, we can conclude that nitrogen is more electronegative than bromine. This means that the N-Br bond is polar, with nitrogen having a partial negative charge (δ-) and bromine having a partial positive charge (δ+).
Therefore, the N-Br bond is more polar than the Br-N bond.
So, the N-Br bond is more polar in the pair N-Br/Br-N.