the-superheroes-of-the-atomic-model-lesson-element.doc - Lesson Element The Superheroes of the Atomic Model Instructions and answers for teachers These

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Lesson Element The Superheroes of the Atomic Model Instructions and answers for teachers These instructions cover the learner activity section which can be found on page 7. This Lesson Element supports OCR GCSE (9-1) Gateway Science Chemistry A and the Twenty First Century Science Chemistry B qualifications. When distributing the activity section to the learners either as a printed copy or as a Word file you will need to remove the teacher instructions section. Mapping to specification level (Learning outcomes) GCSE (9–1) Gateway Science Chemistry A/Combined Science A C1.2a describe how and why the atomic model has changed over time GCSE (9–1) Twenty First Century Science Chemistry B/Combined Science B C2.1.1 describe how and why the atomic model has changed over time to include the main ideas of Dalton, Thomson, Rutherford and Bohr Background information ‘The Superheroes of the atomic model’ task covers the development of the atomic model in an active fact finding resource. This could be an initial lesson on the atomic model and the scientists that developed it into the current atomic model (WS1.1b); or it could be the introduction for a homework looking at the development of the atomic model over time and how scientific ideas change with experimental evidence (WS1.1a). Learners will need to have been introduced to the basic atomic parts: electrons, protons, neutrons and the nucleus, but they need not have an understanding of how these parts come together to form the structure of an atom. Barriers to learning This knowledge can often be time consuming and difficult for learners to retain the important information. This activity aims to address this by allowing all learners to be active participants in the lesson. Version 1 1 © OCR 2017
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Common misconceptions There is a direct link between the atomic model and the chemical characteristics of elements. Prior to Mendeleev most scientists ranked elements by atomic weight ( relative atomic mass ). Mendeleev discovered that when he arranged elements in a grid there were patterns where the characteristics of each element gradually changed across each row and down each column (periodicity) hence the periodic table. Using periodicity Mendeleev saw that the atomic weights ( relative atomic mass ) of elements were sometimes out of sequence and also accurately predicted the characteristics of missing elements. Although Mendeleev did not know what his ranking system was in 1869 we now know that he arranged by atomic number . This is an important concept for learners to understand which can be developed in follow-up lessons reflecting back on the Superhero information finding task. Supporting Information Learners should have covered content on the structure of the atom identifying the different parts and their charges. This will support their understanding of the Gold Foil Experiment and its method.
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