Chemistry · GCSE
Everything Follows From the Outer Shell
Why an element’s place in the table tells you how it will react, and why Mendeleev’s gaps turned out to be right. Six dates on how the model of the atom changed, from Dalton to Chadwick; the particles and the scale of the atom; Mendeleev’s own first table; Groups 1, 7 and 0 with 2,8,1 shell notation; the four scientists a GCSE answer needs; four things the table lets you predict. Eight terms to define, a model answer on why the group trends run opposite ways, and the misconceptions that cost marks.
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