Question

molecule size and induced dipoles
the larger the molecule, the greater the induced dipole will be-and, consequently, the greater will be the london dispersion forces (ldfs, for short). lets take a look at how this relationship plays out in the halogens.
using the image to the right and the molar mass information given, select the correct order of molecules according to their size (smallest on the left to largest on the right).
bromine, chlorine, iodine
chlorine, bromine, iodine
iodine, bromine, chlorine

Explanation:

The size of a molecule is related to its molar mass. A larger molar mass generally indicates a larger molecule. Chlorine (\(Cl_2\)) has a molar mass of \(70.906\ g/mol\), bromine (\(Br_2\)) has a molar mass of \(159.808\ g/mol\), and iodine (\(I_2\)) has a molar mass of \(253.809\ g/mol\). As the molar mass increases from \(Cl_2\) to \(Br_2\) to \(I_2\), the molecule size also increases.

Answer:

Chlorine, bromine, iodine