Rubber

Rubidium

Ruthenium

Rutherford, Ernest

Rutherfordium

Rydberg, Johannes

Salt

Samarium

Sanger, Frederick

Scandium

Scheele, Carl

Schrödinger, Erwin

Seaborg, Glenn Theodore

Secondary Structure

Seibert, Florence

Selenium

Semiconductors

Silicon

Silicone

Silver

Soap

Soddy, Frederick

Sodium

Solar Cells

Solid State

Solid-State Devices

Solution Chemistry

Spectroscopy