On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. He ...

If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the ...

Are you in year 2 and want to revise KS1 English or maths? Are you in year 6 and studying for your KS2 SATs papers? We've got you! Use this page to find videos, activities, quizzes and games from BBC ...