Science Grade 7
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6.1 Structure of an Atom
6.2 Atomic and mass number
6.3 Distribution of Electrons in Shells
6.4 Valency and Ions
6.5 Isotopes and their uses
6.6 Molecules and Chemical Formulae
6.6 Molecules and Chemical Formulae
6.6.1 Molecule
6.6.2 Chemical Formula
6.6.3 Making Chemical Formula of Ionic Compounds
6.7 Law of consant composition
