How can i gauge a molecules intermolecular forces, only using the periodic table?

Question

When comparing two molecules like Br2O3 and SO2

Answer 1

1. look at difference in electronegativity. This will indicate whether a molecule might be polar or not (higher intermolecular forces).
2. try to work out the shape of the molecule, too. This will confirm or refute 1. above.

Answer 2

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