Electron shells and subshells Whiteboard exercise Play

Electron shells and subshells (2) Student activity Play

Electron spin. Pauli's exclusion principle Student activity Play

Electronegativity Student activity Play

Elements of Period 3 of the periodic table Student activity Play

Elements that form covalent bonds Animation Play

Energy diagram Animation Play

Feeding relationships Student activity Play

Formation of a covalent bond between identical atoms Animation Play

Formation of anions from non-metals Student activity Play

Formation of cations by metals of Group 1 Animation Play

Formula of potassium oxide Animation Play

Formulae and nomenclature of ionic compounds Student activity Play

Group 1 Animation Play

Group 18 Animation Play

Group trends Student activity Play

Group trends Animation Play

Habitat and lifestyle of the Roman snail (Helix pomatia) Illustration Play

Hermaphroditism Slideshow Play

Heterogeny; gonochorism and hermaphroditism Student activity Play

How to find the valence of an element from the periodic table Animation Play

Invertebrates Student activity Play

Ionic and atomic radii Student activity Play

Ionic radii of the s-block elements Student activity Play

Ionic radii of the s-block elements Illustration Play