Abstract
Introducing the atom concept in secondary education is problematic from a number of perspectives. For one thing, the concept itself is rather complex (having shifted significantly since its initial historical introduction) and is modelled in a variety of not entirely consistent forms. It is also an entity that is not available to direct perceptions and so is outside the direct experience of learners. The nature of the atom as key concept in learning about chemistry in school science has also been questioned. School teachers are charged with ‘making the unfamiliar familiar’ for learners, and when an unfamiliar concept cannot be demonstrated directly to a class, the teacher introduces it by comparison with what is already within students’ experience. One way of doing this is the teaching analogy, and in the case of the atom, a common teaching analogy is that ‘the atom is like a tiny solar system’. Whilst this comparison has merit, it relies on students having sound knowledge of the structure of the solar system and being able to distinguish positive and negative aspects of the analogy: both assumptions that may be unfounded with many students. A diagnostic instrument designed to test out student understanding of the (planetary model of the) atomic system and the solar system was published as part of a project sponsored by the UK’s Royal Society of Chemistry. In the present study a translated version of that instrument was administered to 458 15–18-year-olds in Turkish schools. It was found that there were strong parallels in the patterns of responses for the two systems, but that only a minority of the students could give an adequate characterisation of the type of forces operating in either system, and only a minority acknowledged that a force between two bodies acts with equal magnitude on both bodies (Newton’s third law – implied in both Coulomb’s law and the universal law of gravity). Examples of student comments, illustrating their thinking, are considered, and the implications for teaching (and in particular the use of the teaching analogy) are discussed.
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Acknowledgement
The authors thank the teachers in the schools for their support in administering the instrument and acknowledge the Royal Society of Chemistry for funding the Teacher Fellowship project during which the original instrument was developed.
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Appendix: The Diagnostic Instrument (in English)
Appendix: The Diagnostic Instrument (in English)
The atom and the solar system | |
The diagram on the right shows a simple model of an atom. |
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N is the nucleus, and there are three electrons, labelled 1, 2 and 3. | |
The electrons are attracted to the nucleus. | |
Below are some questions about the atom shown in the diagram. | |
1. What type of force attracts the electrons towards the nucleus? | |
2. Is electron 3 attracted to the nucleus by a stronger force, a weaker force, or the same size force as electron 1? | |
Why do you think this? | |
3. Which statement do you think is correct (☑) ?: | |
| the force attracting the nucleus to electron 2 is larger than the force attracting electron 2 to the nucleus. |
| the force attracting the nucleus to electron 2 is the same size as the force attracting electron 2 to the nucleus. |
| the force attracting the nucleus to electron 2 is the smaller than the force attracting electron 2 to the nucleus. |
| there is no force acting on the nucleus attracting it to electron 2. |
Why do you think this? | |
4. Is there any force between electron 1 and electron 3? | |
Why do you think this? | |
The atom and the solar system | |
| The diagram on the left shows a simple model of a solar system. |
S is the sun, and there are three planets, labelled A, B and C. | |
The planets are attracted to the sun. | |
Below are some questions about the solar system shown in the diagram. | |
5. What type of force attracts the planets towards the sun? | |
6. Is planet C attracted to the sun by a stronger force, a weaker force, or the same size force as planet A? | |
Why do you think this? | |
7. Which statement do you think is correct (☑) ?: | |
| the force attracting the sun to planet B is larger than the force attracting planet B to the sun |
| the force attracting the sun to planet B is the same size as the force attracting planet B to the sun |
| the force attracting the sun to planet B is the smaller than the force attracting planet B to the sun |
| there is no force acting on the sun attracting it to planet B |
Why do you think this? | |
8. Is there any force between planet A and planet C? | |
Why do you think this? | |
Comparing the atom with the solar system | |
Look at the diagrams, and try to think of ways in which the atom and the solar system are similar, and ways in which they are different. | |
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List the similarities and differences you can think of: | |
In which ways are they similar? | |
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In which ways are they different? | |
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Nakiboğlu, C., Taber, K.S. (2013). The Atom as a Tiny Solar System: Turkish High School Students’ Understanding of the Atom in Relation to a Common Teaching Analogy. In: Tsaparlis, G., Sevian, H. (eds) Concepts of Matter in Science Education. Innovations in Science Education and Technology, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5914-5_8
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