The Changing Atom

Lucy Youle
Mind Map by Lucy Youle, updated more than 1 year ago
Lucy Youle
Created by Lucy Youle over 5 years ago
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Mind Map on The Changing Atom, created by Lucy Youle on 10/04/2014.
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The Changing Atom
1 Democritus
1.1 imagined that atoms were held together with tiny hooks
1.2 Suggested you could divide matter only so many times
2 John Dalton
2.1 All atoms of a given element are the same
2.2 atoms cannot be divided
2.3 atoms are tiny particles that make up elements
2.4 atoms are different in different elements
3 JJ Thomson
3.1 Plum-pudding model
3.1.1 negative electrons in a 'sea' of positive charge
3.1.1.1 = neutral with no overall charge
3.2 He discovered the electron
4 Ernest Rutherford
4.1 2 of his students fired alpha particles at a very thin piece of gold foil
4.1.1 they measured deflection (change in direction) of the particles
4.2 concluded that a plum-pudding model woud hardly deflect alpha particles at all.
4.2.1 the atoms positive charge must be concentrated into a volume much smaller than the size much smalleer than itself
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