Relative abundance of isotopes and mass spectra Student activity Play

Relative atomic mass Student activity Play

Relative atomic mass Whiteboard presentation Play

Relative atomic mass Class activity Play

Relative molecular mass Student activity Play

Roentgen spectra of elements – characteristic radiation Student activity Play

Rutherford's atomic model Student activity Play

Rutherford's experiment Animation Play

Rutherford's experiment Animation Play

Rutherford's experiment Whiteboard exercise Play

Rutherford's model of the atom Animation Play

Saturated and unsaturated compounds Animation Play

Sea water Student activity Play

Semiconductor Animation Play

Sensors Animation Play

Shapes of organic molecules Student activity Play

Sigma (σ) bond Student activity Play

Sigma (σ) bond Whiteboard exercise Play

Sigma bonds in hydrogen fluoride molecule Animation Play

Simplified notation of the configuration of an element Animation Play

Size of matter Student activity Play

Size of the atom Animation Play

Small numbers Student activity Play

Sodium cation Whiteboard exercise Play