Topic 3: Periodicity
3.1 The periodic table
3.1.1 describe the arrangement of elements in the periodic table in order of increasing atomic number.
3.1.2 Distinguish between the terms group and period.
3.1.3 Apply the relationship between the electron arrangement of elements and their position in the table up to Z=20.
3.1.4 Apply the relationship between the number of electrons in the highest occupied energy level for an element and its position in the periodic table.
3.2 Physical properties
3.2.1 Define the terms first ionization energy, and electronegativity.
3.2.2 Describe and explain the trends in atomic radii, ionic radii, first ionization energies, and electronegativities and melting points for the alkali metals, and the halogens.
3.2.3 Describe and explain the trends in atomic radii, ionic radii, first ionization energies, and electronegativities for the elements across period 3.
3.2.4 Compare the relative electronegativity values of two or more elements based on their positions on the periodic table.
3.3 Chemical properties
3.3.1 Discuss the similarities and differences in the chemical properties of elements in the same group.
3.3.2 Discuss the changes in nature, from ionic to covalent and from basic to acidic, of the oxides across period 3.