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Dalton, Thomson and Rutherford's models, and mass of an electron watch

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    For AQA AS Chemistry, do you need to now in detail Dalton and Thomson, and Rutherford and Bohr's models? They are in detail in the CGP books but not specifically mentioned in the spec, but it does say:
    Appreciate that knowledge and understanding of atomic structure has evolved over time

    Also, what do we need to know the relative mass of an electron as? It is listed in most resources as 1/2000, but a mark scheme I just looked at said 1/1800.

    Any AS resources anyone can list would be appreciated, I have end of topic exams soon and have had a series of on and off teacher so not so confident Thank you!
 
 
 
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