CHEMISTRY
1 Describe the structure of an atom in terms of electrons and a nucleus containing protons and neutrons.
2 Describe the build-up of electrons in ‘shells’ and understand the significance of the noble gas electronic structures and of valency electrons
3 State the relative charges and approximate relative masses of protons, neutrons and electrons.
4 Define proton number and nucleon number.
5 Use proton number and the simple structure of atoms to explain the basis of the Periodic Table, with special reference to the elements of proton number 1 to 20.
6 Describe the formation of ions by electron loss or gain.
7 Describe the formation of ionic bonds between metals and non-metals as exemplified by elements from Groups I and VII.
8 Explain the formation of ionic bonds between metallic and non-metallic elements.
9 Determine the formula of an ionic compound from the charges on the ions present.