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A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

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Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Alkaline Earth Metals

Group IIA metals

yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Exothermic

Describes processes that release heat energy.

Dry Cells

Ordinary batteries (voltaic cells) for flashlights. radios, and so on, many are Leclanche cells.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Mother Nuclide

Nuclide that undergoes nuclear decay.