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 As-N
In each pair, the more polar bond is the one with a greater electronegativity difference between the bonded atoms.
1) The bond between N (nitrogen) and Br (bromine):
Looking at the Periodic Table, the electronegativity of N is 3.04 and the electronegativity of Br is 2.96.
The electronegativity difference is 3.04 - 2.96 = 0.08.
2) The bond between As (arsenic) and N (nitrogen):
The electronegativity of As is 2.18 and the electronegativity of N is 3.04.
The electronegativity difference is 2.18 - 3.04 = -0.86.
Therefore, the more polar bond is N-Br (nitrogen-bromine).