Elements are arranged in the periodic table in order of increasing atomic number. For example hydrogen has the atomic number of one, helium two, lithium ... 2,8,1. An atom of sodium has 11 electrons.

Atom Probe Tomography (APT): A technique that allows for the three-dimensional mapping of a material's composition at the atomic level. Lithium Migration: The movement of lithium ions within ...

In your answer, use ideas about electronic structure to explain differences in chemical properties. [6 marks] Group 1 of the periodic table contains the alkali metals lithium, sodium and potassium.