AQA GCSE Chemistry - History of the Atom
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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...