What you’ll learn7 learning objectivesChoose one objective for a focused lesson, or study the complete topic.1.1.1Atomic structure and nucleus• Understand: atoms are mostly empty space around a small dense nucleus (protons/neutrons); electrons occupy shells.Syllabus objective1.1.2Protons, neutrons and electrons• Identify/describe: protons, neutrons and electrons in terms of their relative charges and massesSyllabus objective1.1.3Terms: atomic and proton number, mass• Know terms: atomic and proton number, mass and nucleon numberSyllabus objective1.1.4Distribution of mass and charge within an atom• Describe the distribution of mass and charge within an atomSyllabus objective1.1.5Behaviour of beams of protons, neutrons• Describe the behaviour of beams of protons, neutrons and electrons moving at the same velocity in an electric fieldSyllabus objective1.1.6Determine the numbers of protons, neutrons• Determine the numbers of protons, neutrons and electrons present in both atoms and ions given atomic/proton number, mass/nucleon number and chargeSyllabus objective1.1.7Trends: the variations in atomic radius• State/explain trends: the variations in atomic radius and ionic radius across a period and down a groupSyllabus objective