Final answer:
The nature of the SE-CI bond in selenium chloride (SeCl3) is moderately polar covalent.
Step-by-step explanation:
The nature of the SE-CI bond in a molecule of selenium chloride (SeCl3) can be determined by looking at the electronegativity values of selenium and chlorine. The electronegativity value of selenium is 2.55 and the electronegativity value of chlorine is 3.16. The difference between these values is 0.61, which falls within the range for a moderately polar covalent bond. Therefore, the nature of the SE-CI bond in selenium chloride is moderately polar covalent.