Figure 3 represents different models of the atom - AQA - GCSE Chemistry - Question 4 - 2018 - Paper 1
Question 4
Figure 3 represents different models of the atom.
Which diagram shows the plum pudding model of the atom?
Tick one box.
Which diagram shows the model of the atom ... show full transcript
Worked Solution & Example Answer:Figure 3 represents different models of the atom - AQA - GCSE Chemistry - Question 4 - 2018 - Paper 1
Step 1
Which diagram shows the plum pudding model of the atom?
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Answer
The plum pudding model of the atom is represented by diagram B. This model suggests that atoms consist of a positive 'pudding' with negatively charged electrons embedded in it.
Step 2
Which diagram shows the model of the atom developed from the alpha particle scattering experiment?
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Answer
The model developed from the alpha particle scattering experiment is shown in diagram C. This experiment led to the discovery of the nucleus, indicating that atoms have a dense central core.
Step 3
Which diagram shows the model of the atom resulting from Bohr’s work?
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Answer
Bohr’s model of the atom is illustrated in diagram A. It features quantized electron orbits around the nucleus, showcasing electrons arranged in defined energy levels.
Step 4
Define the mass number of an atom.
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Answer
The mass number of an atom is defined as the sum of the number of protons and neutrons in the nucleus. It represents the total mass of the atom’s nucleus, excluding the negligible mass of electrons.
Step 5
Estimate the relative atomic mass of element X.
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Answer
The relative atomic mass of element X can be estimated to be between 69.5 and 70.0 based on the percentage abundances and mass numbers of its isotopes.
Step 6
Explain how his work led to this understanding.
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Answer
Chadwick provided evidence to show the existence of neutrons, which was necessary because isotopes have the same number of protons but different numbers of neutrons. This understanding allowed scientists to distinguish between isotopes of the same element, which have the same atomic number but different mass numbers.
