Chemical Bonding and Structure structured questions · SEC G2 Science Chemistry component

Learning objectives

• describe the formation of ions by electron loss/gain and that these ions usually have the electronic configuration of a noble gas
• describe, including the use of ‘dot-and-cross’ diagrams, the formation of ionic bonds between metals and non-metals, e.g. NaCl; MgCl2
• relate the physical properties (including electrical property) of ionic compounds to their lattice structure.
• describe the formation of a covalent bond by the sharing of a pair of electrons and that the atoms in the molecules usually have the electronic configuration of a noble gas
• describe, using ‘dot-and-cross’ diagrams, the formation of covalent bonds between non-metallic elements, e.g. H2; O2; H2O; CH4; CO2
• deduce the arrangement of electrons in other covalent molecules
• relate the physical properties (including electrical property) of covalent substances to their structure and bonding.
• describe the differences between elements, compounds and mixtures
• describe the general physical properties of metals as solids having high melting and boiling points, malleable and good conductors of heat and electricity
• describe an alloy as a mixture of a metal with another element, e.g. brass; stainless steel
• identify representations of metals and alloys from diagrams of structures.