GCSE Chemistry Revision "Development of the Periodic Table" скачать в хорошем качестве

GCSE Chemistry Revision "Development of the Periodic Table"

For thousands of questions and detailed answers, check out our GCSE workbooks https://www.amazon.co.uk/Dr-Shaun-Don... Great deals on workbooks for schools https://www.freesciencelessons.co.uk/... In this video, we look at the development of the periodic table. First we look at what is meant by "groups" in the periodic table and why the periodic table is called "periodic". We then look at how the scientists Döbereiner and Newlands made early attempts to categorise elements and why these were not successful. You are not expected to learn the work of these scientists but you could be provided with information about them in the exam and asked questions on them. We then look at the scientist Dmitri Mendeleev. We see how he produced a successful periodic table by arranging the elements by atomic weight. We look at how he switched the order of elements when required and left gaps for undiscovered elements. We finish by looking at how the modern periodic table arranges the elements by atomic number and how this solves the problem of elements being in the wrong order. This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks. Image credits: Dobereiner "https://commons.wikimedia.org/wiki/Fi... By Carl August Schwerdgeburth, 1785-1878 (engraver), and Fritz Ries, 1826-1857 (painter) [Public domain], via Wikimedia Commons" Newlands "https://commons.wikimedia.org/wiki/Fi... By The original uploader was DALIBRI at German Wikipedia. (Transferred from de.wikipedia to Commons.) [Public domain], via Wikimedia Commons" Mendeleev "https://commons.wikimedia.org/wiki/Fi... See page for author [Public domain], via Wikimedia Commons"