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H2Se has the higher boiling point because it has a larger mass and more electrons. Because Se has more electrons, it is more polarizable and therefore has stronger London Dispersion Forces than H2S. This causes it to have a higher boiling point. Hope this helps!
After identifying the intermolecular forces, you would want to look at the size, or amount of electrons in the atom. The more electrons there are, the more polarizable it is. The more polarizable element has the strongest Van der Waals forces and therefore Se would be the higher boiling point.
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