Deriving the formula for the surface area of a sphere 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

Determining the signs of trigonometric functions Student activity Play

Development of atomic theory. Radioactivity Class activity Play

Development of atomic theory. Radioactivity Whiteboard presentation Play

Diffraction of X-rays Animation Play

Diffraction of X-rays Student activity Play

Discovery of the atomic nucleus by Ernest Rutherford Animation Play

Discs in the coordinate system Student activity Play

Distance between centres of two circles Whiteboard exercise Play

Distance to the horizon Animation Play

Dividing a line segment Simulation Play

Dividing a line segment Student activity Play

Dividing the circle into six equal parts Animation Play

Drawing a hexagon inscribed in a circle Student activity Play

Drawing a radius of a circle Whiteboard exercise Play

Early atomic theories Whiteboard exercise Play

Early atomic theories Whiteboard presentation Play

Early atomic theories Whiteboard exercise Play

Early atomic theories Student activity Play

Early atomic theories Class activity Play