This question is about atomic structure - AQA - GCSE Chemistry - Question 4 - 2019 - Paper 1
Question 4
This question is about atomic structure.
Atoms contain subatomic particles.
Table 2 shows properties of two subatomic particles.
Complete Table 2.
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Worked Solution & Example Answer:This question is about atomic structure - AQA - GCSE Chemistry - Question 4 - 2019 - Paper 1
Step 1
Complete Table 2.
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Answer
Name of particle
Relative mass
Relative charge
neutron
1
0
proton
1
+1
Step 2
Define mass number.
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Answer
The mass number is the total number of protons and neutrons in an atom's nucleus.
Step 3
Why is the mass number different in the two isotopes?
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Answer
The isotopes contain different numbers of neutrons.
Step 4
Explain how.
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Answer
Most alpha particles passed straight through the gold foil, indicating that the mass of the atom is concentrated in the nucleus. This suggests that most of the atom is empty space.
Some alpha particles were deflected or reflected, showing that the atom has a positively charged nucleus.
