A section of the periodic table. Nitrogen (red) was thought to not have allotropes with similar structures to heavier elements in its group – phosphorus, arsenic, antimony and bismuth (green) – but ...

In the periodic table of elements there is one golden rule for carbon, oxygen, and other light elements. Under high pressures they have similar structures to heavier elements in the same group of ...

A diet that lacks even obscure elements like selenium will leave almost any creature on earth sick and hobbled, if not dead. Plants are made of the same basic stuff as animals but have different ...

Elemental building blocks -- Chemical discoveries -- Inside an atom -- Periodic table of elements -- Reactions and uses -- Hydrogen -- Alkali metals -- Alkaline earth metals -- Transition metals -- ...

Heavy elements: Researchers created molecules containing actinium (Ac) and Nobelium (No), atoms found on opposite sides of the actinide series of chemical elements. They expect chemical properties to ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...