Atomos is an ancient Greek word meaning 'indivisible' or 'cannot be cut'. Atoms are the building blocks of matter; they are the smallest particles that when combined together have the properties of a particular chemical element, or compound.
Electron configuration
Topic 2.2 Introducing a new model of the atom, which is a development of Bohr's model.
Electrons in atoms
Topic 12.1 Exploring what ionisation energies can tell us about the nature of the atom.
The nuclear atom
Topic 2.1 Introducing the principle of sub-atomic particles.
Periodic table
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