Change in the atomic radius across Period 3 Illustration Play

Changes in atomic radius within a group of s-block elements Animation Play

Changes in electronegativity across Period 3 Animation Play

Changes in the atomic radius of s-block elements within the period Animation Play

Changes in the first ionisation energy across Period 3 Animation Play

Changes in the first ionisation energy across Period 3 Illustration Play

Chemical reactions in practice Whiteboard exercise Play

Chemical reactions in practice Student activity Play

Classification of elements Animation Play

Configuration of the cobalt ion Whiteboard exercise Play

Continuous and line spectra Animation Play

Dalton's atomic theory Animation Play

Democritus' and Dalton's atomic theories Student activity Play

Democritus's atomic theory Animation Play

Density Animation Play

Determination of atomic radii Animation Play

Determination of average atomic mass of boron Animation Play

Determining the atomic radius Animation Play

Determining the composition of atomic nuclei Student activity Play

Determining the composition of atomic nuclei Whiteboard exercise Play

Development of atomic theory. Radioactivity Whiteboard presentation Play

Development of atomic theory. Radioactivity Class activity Play

Diffraction of X-rays Animation Play

Diffraction of X-rays Student activity Play

Discovery of the atomic nucleus by Ernest Rutherford Animation Play