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A proton acceptor

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Diagonal Similarities

Refers to chemical similarities in the Periodic Table of elements of Period 2 to elements of Period 3 one group to the right, especially evident toward the left of the periodic table.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Octane Number

A number that indicates how smoothly a gasoline burns.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Stereoisomers

Isomers that differ only in the way that atoms are oriented in space, consist of geometrical and optical isomers.

 

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

K Capture

Absorption of a K shell (n=1) electron by a proton as it is converted to a neutron.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.