Atomic Structure and the Periodic Table

1 Atoms, Elements and Compounds Define atoms, elements and compounds and explain the differences between them. Spec 5.1.1.1 2 Mixtures and Separation Techniques Describe physical methods for separating mixtures and the principles behind each. Spec 5.1.1.2 3 Development of the Model of the Atom Describe how the model of the atom developed as new evidence was discovered. Spec 5.1.1.3 4 Subatomic Particles Describe the relative charges and masses of protons, neutrons and electrons and the scale of atoms. Spec 5.1.1.4–5.1.1.5 5 Relative Atomic Mass, Atomic Number and Isotopes Define atomic number, mass number, isotopes and relative atomic mass — and calculate Ar from isotope abundances. Spec 5.1.1.6 6 Electronic Structure Describe how electrons fill shells and write electronic configurations for the first 20 elements. Spec 5.1.1.7 7 The Periodic Table Describe the structure of the periodic table and explain how it is organised. Spec 5.1.2.1 8 Development of the Periodic Table Describe how the periodic table developed, including Newlands and Mendeleev's contributions. Spec 5.1.2.2 9 Metals and Non-metals Compare the properties of metals and non-metals and explain them in terms of structure and bonding. Spec 5.1.2.3 10 Group 0 — Noble Gases Describe the properties of noble gases and explain why they are so unreactive. Spec 5.1.2.4 11 Group 1 — Alkali Metals Describe the properties of Group 1 metals and explain trends in reactivity down the group. Spec 5.1.2.5 12 Group 7 — Halogens Describe the properties of halogens and explain trends in reactivity down Group 7. Spec 5.1.2.6