Examlex
In the seventeenth century, serfdom returned to what region of Europe?
Lewis Structure
A diagrammatic method for representing the valence electrons of atoms within a molecule, indicating bonds between them.
Ozone
A molecule made of three oxygen atoms, O3, forming a layer in the Earth's stratosphere that protects life by absorbing most of the sun's harmful ultraviolet radiation.
Resonance Structures
Representations of a molecule showing different configurations of electron pairs, to depict delocalization of electrons within the molecule.
Nitrite Ion
A polyatomic ion with the molecular formula NO2-, derived from nitrous acid.
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