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Atomic theory
is a series of models that developed from experimental evidence
Dalton
Atom is the smallest unbreakable unit of matter /An atom of one element cannot be
changed into an atom of a different element by a chemical reaction./
Thomson
Atoms contain negatively charged particle called electron /Atoms have no electrical charge
Thomson model
to a scoop of chocolate chip ice cream.
Rutherford experiment
Rutherford concluded that the atom is mostly empty space /has a dense, positive charge at its center. This dense center is called the nucleus. (The plural of n
Bohr model
electrons move only in specific orbits around an atom's nucleus, each has specific energy
Why did it take time to discover the neutron?
it has no charge
What is the major difference between the Bohr model and the cloud model?
No electrons do not orbit the nucleus like planets
A modern model in atom
Chadwick showed that another particle exists in the nucleus of atoms. This particle is called a neutron.
