New evidence can change scientific models.
Originally, atoms were thought to be indivisible spheres.
The discovery of the electron led to the plum pudding model – a ball of positive charge
with electrons inside (John Dalton).
The alpha particle scattering experiment showed that atoms have a small, dense,
charged nucleus, leading to the nuclear model.
Niels Bohr proposed that electrons orbit the nucleus at set distances, matching
experimental results.
Later, it was found that the nucleus contains protons – positively charged particles.
James Chadwick discovered neutrons about 20 years after the nucleus was accepted.
,Rutherford's alpha scattering experiment showed that:
● Most alpha particles passed through → atoms are mostly empty space.
● Some deflected → there's a small, dense, positive nucleus.
● A few bounced back → positive charge is concentrated in the nucleus.
This disproved the plum pudding model and led to the nuclear model of the atom.
,
Originally, atoms were thought to be indivisible spheres.
The discovery of the electron led to the plum pudding model – a ball of positive charge
with electrons inside (John Dalton).
The alpha particle scattering experiment showed that atoms have a small, dense,
charged nucleus, leading to the nuclear model.
Niels Bohr proposed that electrons orbit the nucleus at set distances, matching
experimental results.
Later, it was found that the nucleus contains protons – positively charged particles.
James Chadwick discovered neutrons about 20 years after the nucleus was accepted.
,Rutherford's alpha scattering experiment showed that:
● Most alpha particles passed through → atoms are mostly empty space.
● Some deflected → there's a small, dense, positive nucleus.
● A few bounced back → positive charge is concentrated in the nucleus.
This disproved the plum pudding model and led to the nuclear model of the atom.
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