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A dry cell in which the electrolyte contains KOH.

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Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Osmosis

The process by which solvent molecules pass through a semipermable membrane from a dilute solution into a more concentrated solution.

 

Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.

Period

The elements in a horizontal row of the periodic table.

Combination Reaction

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

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Dimer

Molecule formed by combination of two smaller (identical) molecules.