(a)*describe the formation of a covalent bond by the sharing of a pair of electrons in order to gain the electronic confi guration of an inert gas (b) describe, using ‘dot-and-cross’ diagrams, the formation of covalent bonds between non-metallic elements, e.g. H2; Cl2; O2; HCl; N2; H2O; CH4; C2H4; CO2 (c) deduce the arrangement of electrons in other covalent molecules (d) relate the physical properties (including electrical properties) of covalent compounds to their structure and bonding
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