Variable oxidation states – manganese Student activity Play

Variation of electronegativity across a period Illustration Play

Variation of electronegativity across a period Simulation Play

Variation of electronegativity across a period (1) Student activity Play

Variation of electronegativity across a period (2) Student activity Play

Variation of electronegativity within a group Whiteboard exercise Play

Variation of electronegativity within a group Student activity Play

What decides whether an atomic mass is a whole number or not Animation Play

Why atomic masses are not usually whole numbers? Student activity Play

Why it is useful to know the atomic masses of elements? Student activity Play

X-ray radiation Glossary Play

X-ray radiation Student activity Play