What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.2.2.1Structure of the atom as a central• Describe structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shellsSyllabus objective2.2.2Relative charges and relative masses• State the relative charges and relative masses of a proton, a neutron and an electronSyllabus objective2.2.3Proton number/atomic number as the• Define proton number/atomic number as the number of protons in the nucleus of an atomSyllabus objective2.2.4Mass number/nucleon number as the• Define mass number/nucleon number as the total number of protons and neutrons in the nucleus of an atomSyllabus objective2.2.5Electronic configuration of elements• Determine the electronic configuration of elements and their ions with proton number 1 to 20, e.g. 2,8,3Syllabus objective2.2.6Periodic table shell rules: (a) Group• State periodic table shell rules: (a) Group VIII noble gases have full outer shells (b) outer-shell electrons equal group number in Groups I-VII (c) occupied shells equal period numberSyllabus objective