We’re being asked to arrange the molecules in increasing dipole moment.
Recall that the most electronegative element is fluorine (F) while the least electronegative element is francium (Fr).
This means the trend for electronegativity is as follows: it increases from left to right and decreases down a period in the periodic table.
The given elements are:
Arrange the following molecules in order of increasing dipole moment: H2O, H2S, H2Te, H2Se
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