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

 

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Solution

Homogeneous mixture of two or more substances.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Vapor

A gas formed by boiling or evaporating a liquid.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Atomic Orbital

Region or volume in space in which the probability of finding electrons is highest.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Mechanism

The sequence of steps by which reactants are converted into products.

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."