In 1871, Dimitri Mendeleev's periodic table was presented to the world, but missing many of the 118 elements leaving place-holders for those yet to be discovered. Each element added has a unique ...

Three-dimensional depiction of the Periodic Table of Niches. Each box represents a lizard niche (n1-n12). Species pairs from different geographic regions or different evolutionary lineages (clades ...

The periodic table is a fundamental part of understanding chemistry. Elements define our universe: they are the components and foundation of the substances that we interact with every day.

Show students that you have 80 cards (4 for each of the first 20 elements). Before distributing the cards, explain that each card contains information about electrons and energy levels for the first ...

You might not have used the periodic table, but the chances are you'll have seen it. It's known all over the world and when it was created it was a massive step forward for helping scientists to ...