Equipment: Eye protection, gloves. Lithium, sodium, potassium. In small sealed containers, samples of chlorine, bromine (a few drops) and iodine (a few crystals). Tile, forceps, scalpel or small knife. Digital Mendeleev’s Periodic Table presentation CC4b Atomic C1.15 Explain that Mendeleev Write some key words to Students carry out a practical in Work through with number and the thought he had arranged do with atomic structure which they investigate some students: the recall of Period Table elements in order of on the board, e.g. atom, physical properties of metals some chemical symbols increasing relative atomic proton, neutron, and non-metals. They test for elements; how mass but this was not always electron, nucleus, shell. various solids (aluminium, Mendeleev organised true because of the relative Students work copper, sulfur, carbon) for their the elements into a abundance of isotopes of individually or in pairs to electrical conductivity, table; Mendeleev’s use some pairs of elements in the write definitions for these malleability, appearance and of his tables to make periodic table words. density. predictions about elements not yet Explain the meaning of discovered. The focus Equipment: eye protection; C1.16 atomic number of an element of the lesson may battery, bulb, wires with in terms of position in the depend upon the prior crocodile clips; small hammer; periodic table and number of knowledge and heat-resistant mat or wooden protons in the nucleus understanding board; paper towels; 50 cm3 demonstrated by the measuring cylinder; ±0.1 g
Equipment: Eye protection, gloves. Lithium, sodium, potassium. In small sealed containers, samples of chlorine, bromine (a few drops) and iodine (a few crystals). Tile, forceps, scalpel or small knife. Digital Mendeleev’s Periodic Table presentation CC4b Atomic number and the Period Table C1.15 C1.16 Explain that Mendeleev thought he had arranged elements in order of increasing relative atomic mass but this was not always true because of the relative abundance of isotopes of some pairs of elements in the periodic table Explain the meaning of atomic number of an element in terms of position in the periodic table and number of protons in the nucleus Write some key words to do with atomic structure on the board, e.g. atom, proton, neutron, electron, nucleus, shell. Students work individually or in pairs to write definitions for these words. Students carry out a practical in which they investigate some physical properties of metals and non-metals. They test various solids (aluminium, copper, sulfur, carbon) for their electrical conductivity, malleability, appearance and density. Equipment: eye protection; battery, bulb, wires with crocodile clips; small hammer; heat-resistant mat or wooden board; paper towels; 50 cm3 measuring cylinder; ±0.1 g Work through with students: the recall of some chemical symbols for elements; how Mendeleev organised the elements into a table; Mendeleev’s use of his tables to make predictions about elements not yet discovered. The focus of the lesson may depend upon the prior knowledge and understanding demonstrated by the
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