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Essential idea: The arrangement of elements in the periodic table helps to predict their electron configuration. 3.1 Periodic table | Nature of science:Obtain evidence for scientific theories by making and testing predictions based on them—scientists organize subjects based on structure and function; the periodic table is a key example of this. Early models of the periodic table from Mendeleev, and later Moseley, allowed for the prediction of properties of elements that had not yet been discovered. (1.9) | Understandings: * The periodic table is arranged into four blocks associated with the four sub-levels - s, p, d, and f. * The periodic table consists of groups (vertical columns) and periods (horizontal rows). * The period number (n) is the outer energy level that is occupied by electrons. * The number of the principal energy level and the number of the valence electrons in an atom can be deduced from its position on the periodic table. * The periodic table shows the positions of metals, non-metals and metalloids.Applications and skills: * Deduction of the electron configuration of an atom from the element’s position on the periodic table, and vice versa.Guidance: * The terms alkali metals, halogens, noble gases, transition metals, lanthanoids and actinoids should be known. * The group numbering scheme from group 1 to group 18, as recommended by IUPAC, should be used. | International-mindedness: * The development of the periodic table took many years and involved scientists from different countries building upon the foundations of each other’s work and ideas.Theory of knowledge: * What role did inductive and deductive reasoning play in the development of the periodic table? What role does inductive and deductive reasoning have in science in general?Utilization: * Other scientific subjects also use the periodic table to understand the structure and reactivity of elements as it applies to their own disciplines.Syllabus and cross-curricular links:Topic 2.2 - electron configurationAims: * Aim 3: Apply the organization of the periodic table to understand general trends in properties. * Aim 4: Be able to analyse data to explain the organization of the elements. * Aim 6: Be able to recognize physical samples or images of common elements. |

Essential idea: Elements show trends in their physical and chemical properties across periods and down groups.

3.2 Periodic trends | Nature of science:Looking for patterns - the position of an element in the periodic table allows scientists to make accurate predictions of its physical and chemical properties. This gives scientists the ability to synthesize new substances based on the expected reactivity of elements. (3.1) | Understandings: * Vertical and horizontal trends in the periodic table exist for atomic radius, ionic radius, ionization energy, electron affinity and electronegativity. * Trends in metallic and non-metallic behaviour are due to the trends above. * Oxides change from basic through amphoteric to acidic across a period.Applications and skills: * Prediction and explanation of the metallic and non-metallic behaviour of an element based on its position in the periodic table. * Discussion of the similarities and differences in the properties of elements in the same group, with reference to alkali metals (group 1) and halogens (group 17). * Construction of equations to explain the pH changes for reactions of Na2O, MgO, P4O10, and the oxides of nitrogen and sulfur with water.Guidance: * Only examples of general trends across periods and down groups are required. For ionization energy the discontinuities in the increase across a period should be covered. * Group trends should include the treatment of the reactions of alkali metals with water, alkali metals with halogens and halogens with halide ions. | International-mindedness: * Industrialization has led to the production of many products that cause global problems when released into the environment.Theory of knowledge: * The predictive power of Mendeleev’s Periodic Table illustrates the “risk-taking” nature of science. What is the demarcation between scientific and pseudoscientific claims? * The Periodic Table is an excellent example of classification in science. How does classification and categorization help and hinder the pursuit of knowledge?Utilization:Syllabus and cross-curricular links:Topic 2.2 - anomalies in first ionization energy values can be connected to stability in electron configurationTopic 8.5 - production of acid rainAims: * Aims 1 and 8: What is the global impact of acid deposition? * Aim 6: Experiment with chemical trends directly in the laboratory or through the use of teacher demonstrations. * Aim 6: The use of transition metal ions as catalysts could be investigated. * Aim 7: Periodic trends can be studied with the use of computer databases. |

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