IB Chemistry - Periodicity

IB Chemistry home > Syllabus 2025 > Periodicity > The periodic table

The periodic table shows all of the elements arranged in order of increasing atomic number. Mendeleev (among others) first noticed that certain element characteristics or properties tended to repeat in specific intervals. The idea of 'periodic repetition of properties' lead to the table being known as the periodic table of the elements.

In Chapter 5.1