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Atomic models
Change the order of the items in the last four columns to match the dates of the first column.
Date
Person
Model
Description
350 BC
Thomson
Solar
system
model
Atoms consisting of a positive
nucleus with electrons in certain
orbits of fixed energy called
‘shells’.
1803 AD
Rutherford
Indivisible
particles—
atoms
Positively charged spheres with
electrons embedded in them.
1897 AD
Chadwick
Shell model Matter made up of tiny
indivisible particles. This model
was based on observations of
pure substances.
1909 AD
Democritus
Plumpudding
model
The atom as mostly empty space
with a positively charged
nucleus and electrons orbiting
the nucleus.
1913 AD
Bohr
Neutrons in
the nucleus
All matter made up of tiny
building blocks, given the Greek
word atomos meaning unable to
be divided.
1932 AD
Dalton
Indivisible
particles—
atomos
The discovery of neutrons
explained why an atom was
heavier than expected if it
contained only protons and
electrons.
Diagram
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