Education Collections allow us to curate the most relevant online resources related to specific NOVA programs. Use this collection of resources as a source of inspiration for your classroom: find a ...

To the three requirements of a modern Periodic Table, as stated by A. A. Clifford 1, must be added a fourth, namely, that it should be in as close accord as possible with chemical facts, and above all ...

A MODERN table of chemical elements must show electronic configurations as well as the variation in the properties of the elements with atomic number. It should also include the lanthanide and ...