AQA GCSE Chemistry - History of the Atom
1. What is the term used to describe the number of protons present in an atom?
Answer: The atomic number.
2. What is the number of electrons in an atom related to?
Answer: The number of protons.
3. How do you calculate the number of neutrons in an ...
AQA GCSE Chemistry - History of the Atom
1. What is the term used to describe the number of protons present in an atom?
Answer: The atomic number.
2. What is the number of electrons in an atom related to?
Answer: The number of protons.
3. How do you calculate the number of neutrons in an atom?
Answer: By subtracting the atomic number from the atomic mass number.
4. Who described atoms as solid spheres in the 19th century?
Answer: John Dalton.
5. What discovery by JJ Thomson led him to modify his atomic model, introducing the concept of
electrons?
Answer: His measurements of charge and mass revealed the presence of smaller, negatively charged
particles (electrons) within atoms.
6. Why is the "Plum Pudding" model named so?
Answer: Because it depicted a ball of positive charge with electrons embedded within it.
7. What was the outcome of Rutherford's scattering experiments in 1909 that discredited the Plum
Pudding model?
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