Atomic structure

4 lessons in Atomic structure and the periodic table.

22 exam questions · 43 marks

1.6 Developing the model of the atom How the model of the atom developed from Dalton's solid spheres to Thomson's plum pudding, Rutherford's nuclear model from the alpha scattering experiment, Bohr's electron shells and Chadwick's discovery of the neutron, and why models change with new evidence. AQA Edexcel OCR 5 questions 1.7 Protons, neutrons and electrons The structure of an atom: a tiny nucleus of protons and neutrons surrounded by electrons; their relative charges and masses; atomic number and mass number; working out the numbers of each particle; and the sizes of atoms and nuclei. AQA Edexcel OCR 6 questions 1.8 Isotopes and relative atomic mass What isotopes are (atoms of the same element with different numbers of neutrons), how to write them, why relative atomic masses are often not whole numbers, and how to calculate relative atomic mass from isotope masses and abundances. AQA Edexcel OCR 5 questions 1.9 Electronic structure How electrons are arranged in shells (energy levels) for the first 20 elements, writing electronic structures such as 2.8.1 and drawing them, and how the number of outer electrons and shells links to the group and period in the periodic table. AQA Edexcel OCR 6 questions