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1406762
The Changing Atom
Descrição
Mapa Mental sobre The Changing Atom, criado por Lucy Youle em 04-10-2014.
Sem etiquetas
as chemistry
Mapa Mental por
Lucy Youle
, atualizado more than 1 year ago
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Criado por
Lucy Youle
quase 10 anos atrás
13
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Resumo de Recurso
The Changing Atom
Democritus
imagined that atoms were held together with tiny hooks
Suggested you could divide matter only so many times
John Dalton
All atoms of a given element are the same
atoms cannot be divided
atoms are tiny particles that make up elements
atoms are different in different elements
JJ Thomson
Plum-pudding model
negative electrons in a 'sea' of positive charge
= neutral with no overall charge
He discovered the electron
Ernest Rutherford
2 of his students fired alpha particles at a very thin piece of gold foil
they measured deflection (change in direction) of the particles
concluded that a plum-pudding model woud hardly deflect alpha particles at all.
the atoms positive charge must be concentrated into a volume much smaller than the size much smalleer than itself
Anexos de mídia
demo__atom_model.gif (image/gif)
Thomson_Plum_Pudding_Atomic_Model (image/jpg)
rutherfod_and_thomson (image/png)
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