By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2.

There's a clever design to the Periodic Table. Can you guess why every element has its own special spot? See if you're right with BBC Bitesize.

Given the enormous popularity of the periodic table in chemistry, doesn't it make sense to build a periodic table for biology? Pawan Kumar Dhar visualises the anatomy, the potential pay-offs and ...

The periodic table shows all the atoms that everything in the known universe is made from. It’s kind of like the alphabet in which only 26 letters, in different combinations, make up many thousands of ...

The periodic table merges scientific inquiry, international politics, hero worship, desires for structure and desires for credit. Formally, the modern periodic table is a systematic arrangement of ...

The periodic table of the chemical elements is a tabular method of displaying the chemical elements, first devised in 1869 by the Russian chemist Dimitri Mendeleev. Mendeleev intended the table to ...

Give each student a Periodic Table of Energy Levels activity sheet. This table contains energy level models for the first 20 elements. The electrons are included only for the atoms at the beginning ...

The 4D Periodic Table of Chemical Elements is an answer to this question, having a geometric structure related to the hypercube, a four-dimensional cube. Professor Haresh Lalvani published his paper ...

Search Engine Land’s Periodic Table of SEO Elements is back – and this time it’s interactive. Introduced in 2011 (originally known as The Periodic Table Of SEO Ranking Factors), the Periodic ...