Between 1863 and 1866, British chemist John Newlands wrote a series of papers that went on to explain his 'Law of ... Up until this point the atomic number simply referred to an element’s positioning ...
Mixtures - AQA There are different ways to separate mixtures, such as filtration, crystallisation, simple distillation ... number and mass number. The periodic table - AQA Mendeleev made an ...
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