Question

Based on their position on the periodic table, which bond do you expect to be the most polar? Al — S Al — P Be — Cl P — Cl

Answer 1

Answer:Be-Cl

Based on electronegativity difference between two atoms , which one give highest value, those bond have more polar.

Al electronegativity 1.61, S electronegativity 2.58, P electronegativity 2.19,Cl electronegativity 3.16, Be electronegativity 1.57

The difference between two atoms Al-S (2.58-1.61=0.97)

Al-P (2.58-2.19=0.39), Be-Cl (3.16-1.57=1.59), P-Cl (3.16-2.19=0.97)

Be-Cl bond have highest difference of electronegativity (1.59) between Be and Cl atoms. so Be-Cl bond has more polar.