of the molecules sicl4 and sii4, which has bonds that are more polar?
Both SiCl4 and SiI4 molecules have polar covalent bonds, but SiI4 has bonds that are more polar than SiCl4.
This is because iodine (I) is a larger atom than chlorine (Cl), and the larger the atom, the farther away its valence electrons are from the nucleus. As a result, the attractive force between the nucleus and the shared electrons in the bond is weaker for Si-I bonds than for Si-Cl bonds. This means that the electrons in Si-I bonds are more easily pulled towards the I atom, creating a larger electronegativity difference and thus a more polar bond.
Therefore, SiI4 has bonds that are more polar than SiCl4.
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