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?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller bestscores1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.65. You're not tied to anything after your purchase.
