AQA GCSE Chemistry Atomic Structure History
Questions with Verified Answers 2026–2027
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
Pudding - CORRECT ANSWER -
His measurements of charge and mass lead him to the conclusion that smaller negatively charge particle
s had to be there (electrons)
Why was the "Plum Pudding" model given its name? - CORRECT ANSWER -
Because the model showed a ball of lositive charge with electrons stuck in it
Why did Rutherford's scattering experiments in 1909 disprove the Plum Pudding model? -
CORRECT ANSWER -
Because they expected the positive alpha particles to pass through and some slightly delfected but som
e passed through and some deflected straight back more than they expected. Disproving the Plum Pudd
ing
How did Rutherford's scattering experiment in 1909 prove the nucleus. - CORRECT ANSWER -
Some alpha particles bounced straight back from the experiment provingBa body of positive body in the
centre of the atom -Bthe nucleus.
How did Bohr improve Rutherfords atomic model? - CORRECT ANSWER -
He showed that the atom had fixed shell as other wise the negative electrons would be attracted to the
positive protons collapsing the atom.
1
Questions with Verified Answers 2026–2027
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
Pudding - CORRECT ANSWER -
His measurements of charge and mass lead him to the conclusion that smaller negatively charge particle
s had to be there (electrons)
Why was the "Plum Pudding" model given its name? - CORRECT ANSWER -
Because the model showed a ball of lositive charge with electrons stuck in it
Why did Rutherford's scattering experiments in 1909 disprove the Plum Pudding model? -
CORRECT ANSWER -
Because they expected the positive alpha particles to pass through and some slightly delfected but som
e passed through and some deflected straight back more than they expected. Disproving the Plum Pudd
ing
How did Rutherford's scattering experiment in 1909 prove the nucleus. - CORRECT ANSWER -
Some alpha particles bounced straight back from the experiment provingBa body of positive body in the
centre of the atom -Bthe nucleus.
How did Bohr improve Rutherfords atomic model? - CORRECT ANSWER -
He showed that the atom had fixed shell as other wise the negative electrons would be attracted to the
positive protons collapsing the atom.
1
