Occurrence of sulphur Whiteboard exercise Play

Orbital energy and order of assignment to subshells Student activity Play

Orbits of electrons Animation Play

Order of filling of the shells by electrons Animation Play

Other physical properties of alkanes Student activity Play

Other, less important sulphur minerals Slideshow Play

Overlapping of atomic orbitals Animation Play

Oxidation state of sulphur in sulphuric acid(VI) Animation Play

Oxidation state of the phosphorus atom in phosphate(V) ion Animation Play

Oxidation states Animation Play

Oxidation states Student activity Play

Oxidation states of halogens Animation Play

Oxidation states of sulphur Animation Play

Oxidation states of the p-block elements in their commonest chemical compounds Student activity Play

Oxides formed by Period 3 elements Chart Play

Oxides in our surroundings Student activity Play

Oxygen atom and covalent bonding Animation Play

p orbitals Illustration Play

p-block elements Animation Play

Period 3 elements Slideshow Play

Permanent dipoles Student activity Play

Permanent dipoles Whiteboard exercise Play

Permanent dipoles Whiteboard exercise Play

Permanent dipole–dipole moment Animation Play

Permeability and absorption of X-rays Student activity Play