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Trends in melting and boiling points are primarily influenced by molecular structure and intermolecular forces. Generally, as molecular size increases, melting and boiling points rise due to greater van der Waals forces. Additionally, substances with stronger intermolecular forces, such as hydrogen bonds or ionic bonds, will typically have higher melting and boiling points compared to those with weaker forces. In the Periodic Table, melting and boiling points can also vary with group and period, reflecting changes in atomic size and electronegativity.

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