Since then, the periodic table has evolved to reflect over 150 years of scientific development and understanding in chemistry and physics. Today, with 118 known elements, it is widely regarded as one ...

You may use table navigation commands for the screen reader of your choice. The Periodic Table of Elements. Each entry contains the atomic number, chemical symbol, and atomic mass to two decimal ...

In this series, podcast presenters Dr Sunayana Bhargava and Tulela Pea guide you through everything you need to know about atomic structure and the periodic table to ace your GCSE science exam.

The United Nations has designated 2019 as the International Year of the Periodic Table to celebrate "one of the most significant achievements in science". In March, it will be 150 years since the ...

A chemical element is one of those squares on the periodic table that adorns many a classroom wall. Sure. But what is an element really? It is a more subtle question that you might realise.