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The scientist John Dalton lived over 200 years ago - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1
Question 1
The scientist John Dalton lived over 200 years ago. (a) John Dalton suggested an early model of atoms. When Dalton first described atoms he said that - all elements ... show full transcript
Worked Solution & Example Answer:The scientist John Dalton lived over 200 years ago - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1
Step 1
Give two differences between Dalton’s model of atoms and today’s model of atoms.
Answer
- Today, atoms are composed of subatomic particles, such as protons, neutrons, and electrons, rather than being indivisible, as Dalton stated.
- In modern models, atoms of the same element may differ in their number of neutrons, resulting in isotopes, which contradicts Dalton's idea that all atoms of the same element are identical.
Step 2