C1.4.2 describe a test to identify chlorine C12 Chemical 185 (using blue litmus paper) PAG2 Analysis Chapter C2 Chemical patterns C2.1 How have our ideas about atoms developed over time? C2.1.1 describe how and why the atomic C1 Atomic structure 12 model has changed over time to include the main ideas of Dalton, Thomson, Rutherford and Bohr C2.1.2 describe the atom as a positively C1 Atomic structure 14 charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with most of the mass in the nucleus C2.1.3 recall relative charges and C1 Atomic structure 14 approximate relative masses of protons, neutrons and electrons C2.1.4 estimate the size and scale of C1 Atomic structure 16 Very briefly atoms relative to other particles covered C2.1.5 recall the typical size (order of C1 Atomic structure 16 Very briefly magnitude) of atoms and small molecules covered C2.1.6 relate size and scale of atoms to C1 Atomic structure 16 Very briefly objects in the physical world covered C2.1.7 calculate numbers of protons, C1 Atomic structure 15 neutrons and electrons in atoms, given atomic number and mass number of isotopes or by extracting data from the Periodic Table C2.2 What does the Periodic Table tell us about elements? C2.2.1 explain how the position of an C2 The Periodic Table 22/23-24 element in the Periodic Table is related to the arrangement of electrons in its atoms and hence to its atomic number C2.2.2 describe how Mendeleev organised C2 The Periodic Table 22 the elements based on their properties and relative atomic masses C2.2.3 describe how discovery of new C2 The Periodic Table 23 elements and the ordering elements by atomic number supports Mendeleev’s decisions to leave gaps and reorder some elements C2.2.4 describe metals and non-metals C2 The Periodic Table 24 and explain the differences between them on the basis of their characteristic physical and chemical properties, including melting point, boiling point, state and appearance, density, formulae of compounds, relative reactivity and electrical conductivity
C1.4.2 describe a test to identify chlorine (using blue litmus paper) PAG2 C12 Chemical Analysis 185 Chapter C2 Chemical patterns C2.1 How have our ideas about atoms developed over time? 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 C1 Atomic structure 12 C2.1.2 describe the atom as a positively charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with most of the mass in the nucleus C1 Atomic structure 14 C2.1.3 recall relative charges and approximate relative masses of protons, neutrons and electrons C1 Atomic structure 14 C2.1.4 estimate the size and scale of atoms relative to other particles C1 Atomic structure 16 Very briefly covered C2.1.5 recall the typical size (order of magnitude) of atoms and small molecules C1 Atomic structure 16 Very briefly covered C2.1.6 relate size and scale of atoms to objects in the physical world C1 Atomic structure 16 Very briefly covered C2.1.7 calculate numbers of protons, neutrons and electrons in atoms, given atomic number and mass number of isotopes or by extracting data from the Periodic Table C1 Atomic structure 15 C2.2 What does the Periodic Table tell us about elements? C2.2.1 explain how the position of an element in the Periodic Table is related to the arrangement of electrons in its atoms and hence to its atomic number C2 The Periodic Table 22/23-24 C2.2.2 describe how Mendeleev organised the elements based on their properties and relative atomic masses C2 The Periodic Table 22 C2.2.3 describe how discovery of new elements and the ordering elements by atomic number supports Mendeleev’s decisions to leave gaps and reorder some elements C2 The Periodic Table 23 C2.2.4 describe metals and non-metals and explain the differences between them on the basis of their characteristic physical and chemical properties, including melting point, boiling point, state and appearance, density, formulae of compounds, relative reactivity and electrical conductivity C2 The Periodic Table 24