AS and A2 Chemistry notes and resources (WJEC specification) - UNIT CH5 Physical and inorganic chemistry

This unit develops ideas of redox, kinetics, energy changes and equilibria. The inorganic chemistry of some elements in various sections of the Periodic Table is studied.

16.1 - General

Candidates should be able to:

(a) derive the electron configurations of the p-block elements up to Ar and the general outer configuration for each p block group (s2p1, s2p2, s2p3 etc);

(b) show knowledge of the increasing stability of the inert pair (ns2) cations on descent of Groups 3, 4 and 5;

(c) show understanding of why the maximum number of electron pairs which can surround a central atom is greater in Row 3 (Na-Ar) than in Row 2 (Li-Ne), using examples drawn from the Group 5 halides;

(d) explain the term amphoteric behaviour and illustrate this behaviour using reactions of Al3+ and Pb2+ .