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Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

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Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Atomic Radius

Radius of an atom.

Sublimation

The direct vaporization of a sold by heating without passing through the liquid state.

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Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Lewis Acid

Any species that can accept a share in an electron pair.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Matter

Anything that has mass and occupies space.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."