They form coloured compounds and act as catalysts. Sample exam questions - atomic structure and the periodic table - AQA Understanding how to approach exam questions helps to boost exam performance.

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Browse a list of curated classroom activities by the American Association of Chemistry Teachers. Lesson Plans: The Periodic Table and Bonding Download inquiry-based lesson plans and activity sheets to ...

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure ... table according to their atomic number rather than their atomic weight. Today the periodic ...

Try these interactive flashcards based on GCSE chemistry past papers ... elements and compounds, mixtures, atomic structure, Mendeleev's periodic table, groups in the periodic table and transition ...