The halogens exist as diatomic molecules, X2.
Descending through Group 17 from chlorine to iodine the boiling points of the elements increase.
Which statement explains this trend?
Of the permanent dipole in the X2 molecule increases as the group is descended.
The X–X bond strength increases as the group is descended.
the electronegativity of X decreases as the group is descended.
The number of electrons in each X2 molecule increases as the group is descended.
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