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Atomic Structure (Radiation (Beta (when a fast moving electron is released…
Atomic Structure
Radiation
Beta
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very high kinetic frequency electrons, mass=4, charge=2
Alpha
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helium nucleus of 2 protons and 2 neutrons, mass=4, charge=2
Gamma
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very high frequency, electromagnetic radiation, mass=0, charge=0
atomic model
plum pudding model
The Plum Pudding Model is a model of atomic structure proposed by J.J. Thomson in the late 19th century. Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.
Rutherford experiment
in fact most of the alpha particles did go straight through the foil, but some were deflected more than they had expected and the odd one came straight back at them. this was frankly a bit of a shocker. the results of the alpha particle scattering experiment showed that atoms must have small positively charged nuclei at the centre.
They expected that the positively-charged alpha particles would go straight through or be slightly deflected be the electrons is the plum pudding model was true
in 1909 scientists in Rutherford's lab tried firing a beam of a alpha
particle as thin gold foil. A detector screen surrounds the gold foil and the alpha source, and is used to detect alpha particles deflecting be any angle. This was the alpha particle scattering experiment
Neil's Bohr
the Neil's Bohr model consists of a nucleus and outer shells with electrons circling it, this is the model we use today
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