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.
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
The missing entries in Table 2 can be filled as follows:
For the neutron:
Relative mass: 1
Relative charge: 0 (neutron is neutral)
For the proton:
Relative mass: 1
Relative charge: +1
Step 2
Define mass number.
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Answer
The mass number is defined as the total number of protons and neutrons present in the nucleus of an atom. It gives an indication of the size of the nucleus.
Step 3
Why is the mass number different in the two isotopes?
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Answer
The mass number is different in the two isotopes because they contain different numbers of neutrons while having the same number of protons.
Step 4
Explain how.
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Answer
The plum pudding model suggested that atoms are composed of a diffuse positive charge with electrons scattered throughout. However, the alpha particle scattering experiment demonstrated that some alpha particles were deflected, which indicated that an atom has a dense, positively charged nucleus surrounded by electrons. This led to the current nuclear model, which shows most of the mass concentrated in the nucleus and that atoms are mostly empty space.
