properties of these elements unshaded, one half nearby elements in the Students should produce three and their compounds shaded, and one same group. columns or rows in the order Li, C1.14 completely shaded. Ask Cut a piece of lithium Na, K; Mg, Ca, Sr; F, Cl, Br (or Describe how Mendeleev the students to sort the and then potassium on Li, –, K; Mg, –, Sr; F, –, Br, I). used his table to predict the shapes into groups. a tile, describing the existence and properties of There are different ways ease of cutting as you some elements not then in which these could be do this. Ask the discovered sorted including number students to predict C0.1 of sides and amount of what will be observed Recall the formulae of shading. The exercise is when attempting to cut elements, simple compounds intended to encourage sodium, then cut a and ions students to think about piece of sodium and how similar items may describe the ease of be sorted according to cutting. Lithium is the different properties. hardest and potassium is the softest. Show sealed samples of chlorine and iodine. Emphasise how, at room temperature, chlorine is a gas and iodine is a solid. Ask the students to predict the state of bromine, then show a sealed sample of bromine. This is liquid at room temperature and vapour may also be present.
C1.14 C0.1 properties of these elements and their compounds Describe how Mendeleev used his table to predict the existence and properties of some elements not then discovered Recall the formulae of elements, simple compounds and ions unshaded, one half shaded, and one completely shaded. Ask the students to sort the shapes into groups. There are different ways in which these could be sorted including number of sides and amount of shading. The exercise is intended to encourage students to think about how similar items may be sorted according to different properties. Students should produce three columns or rows in the order Li, Na, K; Mg, Ca, Sr; F, Cl, Br (or Li, –, K; Mg, –, Sr; F, –, Br, I). nearby elements in the same group. Cut a piece of lithium and then potassium on a tile, describing the ease of cutting as you do this. Ask the students to predict what will be observed when attempting to cut sodium, then cut a piece of sodium and describe the ease of cutting. Lithium is the hardest and potassium is the softest. Show sealed samples of chlorine and iodine. Emphasise how, at room temperature, chlorine is a gas and iodine is a solid. Ask the students to predict the state of bromine, then show a sealed sample of bromine. This is liquid at room temperature and vapour may also be present.
GCSE-9-1-Science-Term-2-detailed-planning-document.docx