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Refers to the occurrence of an element in an uncombined or free state in nature.

 

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Lead Storage Battery

Secondary voltaic cell used in most automobiles.

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Endothermic

Describes processes that absorb heat energy.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Fuel Cells

Voltaic cells in which the reactants (usually gases) are supplied continuously.
A voltaic cell that converts the chemical energy of a fuel and an oxidizing agent directly into electriacl energy on a continuous basis.

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.

Calorimeter

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