Summary and Exam Tips for Atomic Structure & Periodic Table
Atomic Structure & Periodic Table is a subtopic of Atomic Structure and the Periodic Table, which falls under the subject Chemistry in the AQA GCSE curriculum. This unit covers the fundamental concepts of atomic structure and the organization of the periodic table. Pure substances are single elements or compounds not mixed with other substances, while mixtures consist of physically combined substances. Separation techniques like distillation, filtration, and chromatography are used to separate mixtures. Chemical equations describe reactions, with word equations using full chemical names and symbol equations using formulas. The atom consists of protons, neutrons, and electrons, with the nucleus containing protons and neutrons. Isotopes have the same number of protons but different neutrons. The periodic table arranges elements by increasing atomic number, grouping elements with similar properties. Metals are characterized by high melting points and conductivity, while non-metals have different properties. Group 1 elements are alkali metals, Group 7 are halogens, and Group 0 are noble gases. Transition metals have high densities and form colored compounds.
Exam Tips
- Mass Number: Remember, it's the larger number; the atomic number is smaller.
- Electron Configuration: Focus on the outer shell in dot and cross diagrams.
- Periodic Table Arrangement: Elements are ordered by proton number; similar properties are grouped.
- Chemical Equations: Balance symbol equations to reflect the Law of Conservation of Mass.
- Group Trends: Understand reactivity trends in Groups 1 and 7; reactivity increases down Group 1 but decreases down Group 7.
