Mendeleev's arrangement
Mendeleev's arrangement
Dmitri Mendeleev arranged the elements known in the 1860s mainly in order of increasing relative atomic mass. He started a new row when similar chemical behaviour appeared again, creating columns containing elements with similar properties.
Step-by-step lessons on Edexcel GCSE Chemistry 2.2.1 Mendeleev's periodic table. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.