CHEMISTRY · Single correct · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties
Problem
Chlorine is a greenish-yellow gas, bromine is a dark red liquid, and iodine is a dark grey solid. Identify the property which most directly causes these differences in volatility.
(1) the halogen-halogen bond energy
(2) the number of neutrons in the nucleus of the halogen atom
(3) the number of outer electrons in the halogen atom
(4) the number of electrons in the halogen molecule