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Polydimethylsiloxane (PDMS) is a polymer composed of repeating units of siloxane (Si-O) with methyl groups (CH₃) attached to the silicon atoms. The Lewis dot structure for PDMS would represent silicon (Si) atoms connected to oxygen (O) atoms, with each silicon having two methyl groups attached. In a simplified form, you can visualize a chain of alternating Si and O atoms, with each Si atom surrounded by the appropriate number of dots to represent its valence electrons and each methyl group represented as CH₃. However, due to its large size and complexity, PDMS is often better represented in structural or molecular models rather than a simple Lewis dot diagram.

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