S3.1 Periodic table (1) - classification of elements
This introductory section to the periodic table shows how the 118 elements are arranged vertically into groups, horizontally into periods and separated into s, p, d and f blocks. The importance of electron configuration for elements up to Z = 36 and the importance of how valence electrons and the outer energy level relate to their metallic, metalloid and non-metallic classification are covered. How does the periodic...