A new model rectifies the long-standing deficiencies of the electronegativity concept.

In this video excerpt from NOVA's "Hunting the Elements," New York Times technology columnist David Pogue investigates chemical reactions involving sodium. Find out how the electron configuration of ...

The film discusses the classification of matter into homogeneous and heterogeneous types, focusing on elements, compounds, and mixtures. It explains the properties of two elements, iron and sulfur, ...

NASA's Mars rover Curiosity has detected several simple carbon-based organic compounds on Mars, but it remains unclear whether they were formed via earthly contamination or whether they contain only ...