Describe the formation of a covalent bond by the sharing of a pair of electrons between two atoms
· understand covalent bonding as a strong attraction between the bonding pair of electrons and the nuclei of the atoms involved in the bond
· explain, using dot and cross diagrams, the formation of covalent compounds by electron sharing for the following substances: i hydrogen ii chlorine iii hydrogen chloride iv water v methane vi ammonia vii oxygen viii nitrogen ix carbon dioxide x ethane xi ethene.
same as hydrogen but six more on outer shells
· recall that substances with simple molecular structures are gases or liquids, or solids with low melting points
· explain why substances with simple molecular structures have low melting points in terms of the relatively…