A concise lesson presentation (27 slides) that looks at the key details of the sub-atomic particles and briefly explores how the atomic and mass numbers of the Periodic Table can be used to calculate the numbers of these particles in different atoms. The lesson begins with a Mathematical link as students are challenged to convert the size of an atom from standard form into a real number. Moving forwards, students will meet the three sub-atomic particles and be asked to predict which one is positive, neutral and negative in charge. The relative mass of a proton is shown and then students are asked to work out the mass of a neutron and an electron by observing some experimental results with a scales. Finally, the students are shown how to use the atomic number to work out the number of protons (and electrons) in an atom and how to work out the number of neutrons. This lesson has been designed to act as a knowledge recall and top-up as this should have already been learnt at KS3.
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