History of the Atom | GCSE Chemistry Practice
The model of the atom has changed over time as new scientific evidence emerged.
Who discovered the electron?
What is History of the Atom | Practice?
"The historical development of our understanding of atomic structure."
Which model described the atom as a ball of positive charge with electrons embedded in it?
What did the alpha particle scattering experiment prove?
Who provided the evidence to show that neutrons exist in the nucleus?
Atomic Model Timeline
Plum Pudding Model: Ball of positive charge with electrons embedded.
Alpha Scattering Experiment: Discovered the nucleus.
Bohr Model: Electrons in energy levels (shells).
Chadwick: Discovered Neutrons.
Evidence Tip: Most alpha particles went straight through gold foil, proving atoms are mostly empty space.
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