AQA GCSE CHEMISTRY - HISTORY OF THE ATOM QUESTIONS WITH CORRECT ANSWERS 2026

AQA GCSE CHEMISTRY - HISTORY OF THE ATOM
QUESTIONS WITH CORRECT ANSWERS 2026
Amount of protons - CORRECT ANSWER -Atomic number



Amount of electrons - CORRECT ANSWER -Protons



Amount of neutrons - CORRECT ANSWER -Atomic mass number - Protons



John Dalton described atoms as what? C19th - CORRECT ANSWER -Solid Spheres



In 1897 JJ Thompson found out what about atoms thatmade him change the atomic model to the Plum Puddi
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ng - CORRECT ANSWER -
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His measurements of charge and mass lead him to the conclusion that smaller negatively charge particle s
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had to be there (electrons)
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Why was the "Plum Pudding" model given its name? - CORRECT ANSWER -
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Because the model showed a ball of lositive charge with electrons stuck in it
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Why did Rutherford's scattering experiments in 1909 disprove the Plum Pudding model? -
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CORRECT ANSWER -
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Because they expected the positive alpha particles to pass through and some slightly delfected but som e
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passed through and some deflected straight back more than they expected. Disproving the Plum Pudd ing
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How did Rutherford's scattering experiment in 1909 prove the nucleus. - CORRECT ANSWER -
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Some alpha particles bounced straight back from the experiment provingBa body of positive body in the c
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entre of the atom -Bthe nucleus. X2 X2 X2 X2 X2




How did Bohr improve Rutherfords atomic model? - CORRECT ANSWER -
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He showed that the atom had fixed shell as other wise the negative electrons would be attracted to the p
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ositive protons collapsing the atom. X2 X2 X2 X2