An electron-proton pair Animation Play

An upward vertical projection and free fall Student activity Play

An upward vertical projection and free fall Whiteboard exercise Play

Annihilation Animation Play

Annihilation and creation Animation Play

Annihilation and creation Whiteboard exercise Play

Annihilation and creation Student activity Play

Antimatter Animation Play

Antiparticles Animation Play

Antiparticles – matter and antimatter Student activity Play

Apparent weightlessness Student activity Play

Apparent weightlessness Whiteboard exercise Play

Application of an electron microscope Student activity Play

Application of an electron microscope Slideshow Play

Application of an electron microscope Whiteboard exercise Play

Application of capacitors in electronics Animation Play

Assigning electrons to atomic orbitals Student activity Play

Assigning electrons to atomic orbitals Whiteboard exercise Play

Atomic number Animation Play

Atomic number Student activity Play

Atomic number and mass number Student activity Play

Atomic radii Animation Play

Atomic radii of the s-block elements Student activity Play

Atomic radius Student activity Play

Atomic radius Whiteboard exercise Play