At the start of the ________ described atoms as solid spheres and said that different sphere made up the different elements.
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Bohr
________ proposed that electrons orbit the nucleus in fixed shells and arent anywhere in between.
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Ernest Rutherford
In 1909 ________ and his student Ernest Marden conducted the famous alpha particle scattering experiments.
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Bohrs theory of atomic structure
________ was supported by many experiments and it helped to explain lots of other scientists observations at the time.
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shell
Each ________ is a fixed distance from the nucleus.
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Rutherford came up with an idea to explain his new evidence
the nuclear model of the atom
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Plum pudding model
the atom is a ball of positive charge with electrons embedded in it
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John Dalton model
atoms as solid spheres
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who did plum pudding model
J J Thompson
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Niel Bohr nuclear model
electrons orbit the nucleus in fixed shells and distances, and aren't anywhere in between
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How did they discover the nuclear model
They fired positively charged alpha particles at an extremely thin sheet of gold
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Nuclear model experiment finding
When alpha particles cam near the concentrated, positive charge of the nucleus, they were deflected. If they were fired directly at the nucleus,they were deflected backwards. Otherwise, they passed through the empty space
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Nuclear model
a cloud of negative electrons surround the nucleus, and most of the atom is empty space. Electrons are randomly placed
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Nuclear model inventors
Ernest Rutherford and Ernest Marsden
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J J Thompson tests
his measurements of charge and mass showed an atom must contain even smaller, negatively charged particles, electrons
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James Chadwick experiment
Provided evidence for neutral particles in the nucleus, called neutrons
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Rutherford further discovery
Showed that the nucleus can be divided into smaller particles, which each have the same charge as a hydrogen nucleus, called protons
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Order of discoveries
John Dalton - plum pudding model - nuclear model - bohr nuclear model - modern nuclear model
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Order of discoveries names
John Dalton - J J Thompson - Ernest Rutherford - Niels Bohr - James Chadwick
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Nucleus, shells and electrons relationship
Nucleus is in the centre of the atom and electrons orbit the nucleus in shells
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