Early periodic tables were produced before the structure of the atom was known. Which property were the elements arranged in order of in these early tables?
The number of protons in each atom of the element
The atomic weight of each atom of the element
The number of outer electrons in each atom of the element
The number of neutrons in each atom of the element
40 exam-style questions on AQA GCSE Chemistry 1.2 The periodic table, covering 1.2.1 The periodic table, 1.2.2 Development of the periodic table, 1.2.3 Metals and non-metals, 1.2.4 Group 0, 1.2.5 Group 1, and 1.2.6 Group 7. Each one has a worked solution and a mark scheme showing where the marks go.