Early periodic tables were incomplete, since many elements were unknown. Also, some elements were placed in groups with elements that were not similar to them. Mendeleev left gaps in his table for ...
In this episode, Dr Sunayana Bhargava and Tulela Pea look at how the periodic table developed to the modern one we use today. Suitable for: AQA, Edexcel, OCR. For more information on the periodic ...
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