11595
The interactions can be understood in terms of electrostatics / polarization and dispersion ; they involve a region of positive electrostatic potential on a covalently bonded halogen and a negative site , such as the lone pair of a Lewis base .
 Chemical: halogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: halogen