CCEA ADVANCED SUBSIDIARY
CHEMISTRY
1.2 Bonding
PRE-KNOWLEDGE
Before you start work on this Unit, you should be
able to:
(1) write
the names and electron configurations of the first twenty elements in the
Periodic Table;
(2) state
and apply the 'noble gas rule' (sometimes called the 'octet rule') to describe
the likely electron configurations of atoms in compounds;
(3) describe
ionic bonding in simple cases (e.g. sodium chloride) in terms of electron
transfer, using simple electron-shell diagrams;
(4) describe
covalent bonding in simple cases (e.g. chlorine and methane) in terms of
electron sharing, using simple electron-shell diagrams;
(5) draw
structural formulae for simple covalent molecules, using short straight lines
to represent covalent bonds.
(6) recognise
that elements and compounds exist either as molecules or as giant structures,
and give some examples of each;
(7) write
formulae (not structural) for the following polyatomic ions -nitrate,
carbonate, hydroxide, sulphate, hydrogencarbonate, ammonium;
(8) define
oxidation and reduction in terms of electron transfer and give some simple
examples.