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A Nuclear particle with the mass of an electron but opposite charge.

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Covalent Compounds

Compounds containing predominantly covalent bonds.

Matter

Anything that has mass and occupies space.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Crystalline Solid

A solid characterized by a regular, ordered arrangement of particles.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Gangue

Sand, rock, and other impurities surrounding the mineral of interest in an ore.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.