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Unformatted text preview: .. What does this reveal about its properties? 3 The superscripts sum to 61 We have a partly filled f shell, hence a rare earth metal. It is likely to have a variable valency and be reactive. . 4. d '-To illustrate what ~ did I show this diagram on the overhead projector at this time? What is the contrast with? * Directional bonding leads to directional properties. * The properties of graphite in the basal plane are very .different to the properties in the direction perpendicular to that plane, for example, stiffness, electrical and theffi1al conductivity. * The contrast is with cubic diamond. 5. A polyethylene molecule can be represented as -[-CH2CH2-]-no What degree of polymerization would be required to give a molecule of molecular weight 50,008 amu? MW = nxmass/mer mass/mer 6. What is the purpose of the two Callister text diagrams? He is contrasting covalent and metallic bonding....
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- Fall '11