To determine which pair of atoms has the greatest difference in electronegativity, we need to calculate the electronegativity difference for each option:
A. Ca – Cl \( |1 - 3.16| = 2.16 \)
B. H – Cl \( |2.2 - 3.16| = 0.96 \)
C. Fe – Cl \( |1.83 - 3.16| = 1.33 \)
D. P – Cl \( |2.19 - 3.16| = 0.97 \)
Now, let's compare the differences:
- Ca – Cl: 2.16
- H – Cl: 0.96
- Fe – Cl: 1.33
- P – Cl: 0.97
The pair with the greatest difference in electronegativity is A. Ca – Cl with a difference of 2.16.