THE ELEMENTS OF LIFE (EL)

Answers to Ideas sections

1.1 Amount of substance

1.2 Balanced equations

2.1 A simple model of the atom

2.2 Nuclear reactions

2.3 Electronic structure:shells

3.1 Chemical bonding

3.3 The shapes of molcules

6.1 Light and electrons

11.1 Periodicity

11.2 The s block: Groups 1 and 2